The Gun Digest Book of the AR-15
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About this ebook
Now you can become an AR-15 expert. Noted author and gunsmith Patrick Sweeney takes an inside look at an icon among American rifles. The AR-15 first became known to American shooters in the early 1960s. Since then is have become one of the most versatile rifles in the world, tackling everything from military and police operations to long-range target competitions.
Sweeney's expertly written text and outstanding photography show you everything you need to know about understanding the AR-15 operating system and his dedicated group of testers honestly evaluate just about every rifle on the market. If there is something you want to know about an AR-15, you will find it here.
Patrick Sweeney
Patrick Sweeney is a certified master gunsmith and armorer instructor for police departments nationwide. He is author of many Gun Digest books, inculding Gun Digest Book of the 1911 Vols. 1 & 2, Gun Digest Book of the Glock Vols. 1 & 2, Gun Digest Book of the AR-15 Vols. 1, 2, 3 & 4, Gunsmithing: Rifles, Gunsmithing: Pistols & Revolvers 1 & 2, and Gunsmithing the AR-15 Vols. 1 & 2.
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The Gun Digest Book of the AR-15 - Patrick Sweeney
©2005 Gun Digest Books
Published by
Gun Digest Book
An imprint of F+W Publications
9780873499477_0003_002Our toll-free number to place an order or obtain
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All rights reserved. No portion of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher, except by a reviewer who may quote brief passages in a critical article or review to be printed in a magazine or newspaper, or electronically transmitted on radio, television, or the Internet.
Library of Congress Catalog Number: 2005922945
ISBN: 0-8739-947-6
eISBN: 978-1-44022-437-9
Designed by Kara Grundman
Edited by Kevin Michalowski
Printed in the United States of America
ACKNOWLEDGMENTS
First, let me thank the manufacturers who sent me their product in the hopes I would praise them to the skies, and like them so much I’d actually want to buy them, thus saving their shipping department the hassle of re-entering it in the bound book. Seriously, manufacturers take a leap of faith in sending out guns.
So I’d like to thank them all for sending a rifle or rifles. In particular, Walt Kulek of Fulton Armory, who practically had rifles here before I finished the cup of coffee I’d been sipping when we discussed the project. Tom Spithaler, of Olympic, who kindly answered my questions about how ARs are made and what goes into them. Mark Westrom and the whole crew at Armalite, for allowing me to wander the plant for a day and take photos and pester them with endless questions. Jeff Hoffman of Black Hills, who did his best once again to bury me in ammunition.
And most of all, thanks to Felicia, for her support, encouragement, and for listening to me prattle on about the latest tidbits of AR lore that I might have found each day, and not letting on that I was boring her to tears. Without her help in the beginning, I never would have gotten this far.
9780873499477_0004_001INTRODUCTION
For those of us tuned into guns, a firearm represents a time, place, incident or age. If you see someone in a suit, holding a Thompson, you immediately think Roaring Twenties.
The same image, but with Winston Churchill instead of an anonymous person, and you think WWII.
If you see a tri-corner hat and a smooth-bore musket, you think American Revolution.
(with apologies to my international readers, who may think of some other fracas)
The M-16 brings up a plethora of images, each with a particular time and place. A triangular handguard and a plain green uniform brings recollections of Vietnam. Round handguards and woodland camouflage brings photographs from Central America to mind, or to someone stationed in Europe, Germany, Italy, Belgium or Turkey. And an M-4 and tan/desert uniforms bring to mind Afghanistan, Iraq and whatever else the current situation brings us.
The ubiquity of the AR-15/M-16 rifle is due to exposure and time. While you or I might only have a single drawing of the American Revolution to fix that image in our memories, we have a constant repetition of images of modern rifles, courtesy the modern news media. As an example, several friends of mine, when they see an AK-47, cannot escape the visceral reaction of there is something terribly wrong here
while my first reaction on seeing one is to think of the news photo of an AK being held aloft at Wounded Knee. (As far as I know, no one was ever prosecuted for owning or handling that firearm. Never mind that at that time there was no such thing as a semi-automatic only AK, and thus it had to be a select-fire rifle.) They were a few years older, there in the jungle, and I was reading the newspapers at home.
The AR-15 has been with us now for over 40 years. Longer than the ’03 Springfield was a front-line rifle, longer than the M-1 Garand, and far longer than the M-14. (Despite the M-14 still being used in many tasks, it isn’t a front-line, general-issue weapon.) Despite the struggles of the 30-caliber crowd, the AR has supplanted 30-caliber rifles as the winner in target competitions. It is now being accepted as a law enforcement tool, and is embraced by many as an entirely suitable defensive firearm. There are still some who feel it isn’t powerful enough, but powerful enough
is not a valid question. If it were, we’d still be using rifles with designations that start in 5
or 6
as only those calibers can be depended on to stop miscreants reliably. As in 50- caliber or bigger, although there were instances in the American Civil War of combatants who were shot with .58 caliber Minie balls who kept on fighting. Indeed, there were reports over a century ago coming back from the Indian Frontier about the adoption of a smaller caliber. From British Officers, complaining that the new .303 round did not stop the natives as well as the old .45 had.
The AR is deceptive: It is both the easiest rifle to home-gunsmith, and can be the most maddening to get properly assembled and reliably functioning. When I was a practicing professional gunsmith, during the height of the first (there will be more to come, I’m sure) wave of home-assembled kits, I did a good business finishing the assembly and ensuring proper function of home-assembled AR kits that the owners had gotten almost finished. Sometimes they needed a special tool to finish, something too expensive to buy for a one-time build. Or in other cases they needed special knowledge to figure out the real problem, and apply the correct fix, not the obvious
and wrong one.
The AR doesn’t need any specialized stock work, no sanding, oil-finished wood, or complicated glass bedding. It doesn’t need (in most cases) a free-floated barrel or special bedding methods. The triggers are simple, and with a little work or the right parts can be quite livable. And the recoil is soft, encouraging practice, practice and more practice. Where you can beat yourself into a flinch in an afternoon with a 30-caliber rifle, you can burn out an AR barrel on a weekend with no fear of a dreaded flinch.
And for the gadget buffs there is perhaps no rifle on the face of the planet for which you can buy more gear, accessories, add-ons, improvements and just plain stuff.
You could easily take a 6-pound AR and turn it into a 12-pound AR by bolting on essential additions.
Indeed, target shooters add plain old lead weights to bring their ARs up past 15 pounds, to make them more stable for long shots.
Those who have read my earlier books know my methods in these matters. In order to properly address the field of AR-15 rifles, I needed rifles to test. It would not be suitable to simply photograph and write about my own rifles. For the most part, they are not stock. And they have all been fussed over until they can be depended on for reliable function. And it would not be acceptable to simply digest and re-write the press handouts of various manufacturers and wholesalers. Not that they would lie, but the whole idea of marketing is to remove dispassionate analysis and replace it with lust. So, I needed rifles. But what to cover? There are a host of parts suppliers, and gunsmiths who are at least basically competent to build an AR. Many are more than just competent, and turn out marvels of reliability and accuracy. How to decide which guns, options, accessories and custom features for the first book? I settled on two tests, both of which a manufacturer had to meet, or I would not give a full test and review: They had to manufacturer or assemble complete rifles. And they had to have their name on the receiver. Bob Smith of Bob Smiths Gunsmithing
may build excellent ARs for his SWAT and competition customers. But if it didn’t say Bob Smith Armory
on the receiver, he’d have to wait for the second book. Assembly was also a requirement. If a firm offered complete kits, but not assembled rifles, they too would wait. I inquired with all the manufacturers I could find. In the process of writing the book, I found even more than had known of. I figured I’d be lucky to locate a dozen makers. I ended up with over 30 rifles. And, I re-discovered the world of marketing. A world where some makers are much better than others.
As you read this there are no doubt makers who have yet to send the promised rifle or rifles. I asked everyone I could find, and in this regard the internet is quite useful. I found makers who had a rifle to me by the end of that week. I found makers who took six months to get me a rifle. I found makers who promised and didn’t deliver. And others who were more than happy to sell me a rifle, but had none to loan. For the readers who are still under the illusion that all gun writers get to keep the goodies
I have news for you: the local FedEx office knows me on sight. Rifles go back. There are some writers who keep everything that is sent to them. They are well-known in the industry and receive a very few rifles for testing. (Some of my problems in getting test rifles may be due to unfortunate experiences on the part of the manufacturer with those other writers.) Let me repeat this for those who feel I may have slighted their favorite rifle: I asked everyone I could track down. I tested all rifles that were sent to me. If a rifle did not meet my expectations, I inquired with the maker for a solution. If the problem was solved, I did not make a fuss over it. If it didn’t return, or was never satisfactorily fixed, it did not make it into the book.
I also needed ammo. I cannot say enough good things about Jeff Hoffman at Black Hills, and the staff at Hornady. My delivery driver staggered under the load of ammo shipped. There was nothing I asked for that I didn’t receive at least some amount. Some of the ammo, like the Mk 262 Mod 1, so highly sought-after in Iraq and Afghanistan, was scarce enough in the pipeline that I only got enough to test the rifles for accuracy. Fair enough, the guys overseas have a more-pressing need for it than I do.
So, if there is a rifle you were curious about, but I don’t list, there is a reason. I left out none of the ones I received that worked. Good or indifferent, the performance of each was noted. The really bad ones will have to try harder for Volume 2. Some were so good I really, really considered buying rather than sending back. But what is a man to do with a dozen AR-15s?
The AR-15 is presently in a resurgence. There are more manufacturers than there have ever been. The armed forces are using more of them than they have in more than a generation. (You thought everyone in the Army or Marine Corps spent all their time on the range, wearing out rifles? You poor, mislead taxpayer!) They are also looking to replace it with more fervor than they ever have. However, the latest rounds are not trying to replace it with an all dancing, all singing
electronic rifle. Yes, we can currently have a PDA that is also a cell phone, digital camera, GPS unit and MP3 player. But rifles aren’t consumer electronics. Rifles launch bullets, and nothing in the digital revolution so far (except CNC machining stations) has changed how rifles work or are used. But the next decade or so promises to be very entertaining in the regard of attempts to replace the AR.
As for the next volume, that will be out soon, and there we’ll dive headfirst into modifications, basic gunsmithing and maintenance (beyond cleaning) and accessories galore. We’ll also cover the guns that didn’t arrive in time, or took a lot of work to struggle up to satisfactory performance. Use this book to select and purchase a basic gun. Then, when you encounter the second volume, you’ll have had a good time shooting your gun and planning the modifications, upgrades and improvements.
CONTENTS
Title Page
Special Offers
Acknowledgments
Introduction
CHAPTER 1 History
CHAPTER 2 How it Works
CHAPTER 3 Barrels
CHAPTER 4 Ammo
CHAPTER 5 Testing
CHAPTER 6 Cleaning and Maintenance
CHAPTER 7 Magazines
CHAPTER 8 Myths
CHAPTER 9 AR vs. AK
CHAPTER 10 Patrol Rifle Conversion
CHAPTER 11 Competitions
CHAPTER 12 Carry Gear
CHAPTER 13 Training
CHAPTER 14 Legalities
CHAPTER 15 Armalite
CHAPTER 16 DPMS
CHAPTER 17 Bushmaster
CHAPTER 18 Colt
CHAPTER 19 DoubleStar
CHAPTER 20 Olympic
CHAPTER 21 DS Arms
CHAPTER 22 Fulton
CHAPTER 23 JP
CHAPTER 24 Cloud Mountain Armory
CHAPTER 25 Wilson
CHAPTER 26 Clark
CHAPTER 27 Vulcan
CHAPTER 28 StagArms
CHAPTER 29 Gunsmithing
Conclusion
CHAPTER 1
History Of The AR-15 And How It Is Made
Iam not going to give you a detailed, blow-by-blow history of the trials, tribulations, acceptance and use of the AR-15/M-16. There are a number of books out there in which you can find out the exact date some such memo or another was written, authorizing this or squashing that. If you want historical minutia (which some of us do) then try those other titles. My intent here is to point out some of the highs and lows, and illustrate how they created the rifle we now use, build, wear out and invest so much passion in.
The history of the AR-15/M-16 is actually a four-part story so far. First, there is the story of the change in how a rifle was viewed and used, from the adoption of a modern service rifle in the late 19th century to the middle 20th. Then, the acceptance and adoption of the M-16 by the U.S. Department of Defense. Third, the improvements made to it, and the acceptance of the AR by civilian shooters. And finally, the culmination of the M-16 into the M-4, and the acceptance (so far) by the Armed Forces that the digital revolution was not going to come to small arms anytime soon.
9780873499477_0009_001The AR now is not the same as the M-16. In the early days, it was often called both by its manufacturer, Colt.
Just to keep us all from going crazy, and to make my editor’s job easier, I will as of this moment stop using the clumsy construction of AR-15/M-16.
When I’m talking about the rifle system in general, I’ll simply use AR-15.
When I mean the select-fire or burst-fire basic system, I’ll call it M-16.
And when I’m talking about a specific rifle or model, I’ll use its exact designation, like M-4, XM-177, etc. Otherwise you’d be faced with the prospect of seeing the clumsy construction a couple of thousand times. (And I’d have to type it, making us all a bit cranky.) And as the rifle was known as the AR-15 even for a while after it was made as a select-fire weapon (I’ve seen a bunch of military select-fire rifles marked AR-15
, made by Colt) it is correct to call them all that. Be aware that Colt owns the rights and trademark to AR-15
and no rifle not made by Colt can be properly or legally called that. Now that we’ve gotten all cozy with a comfortable agreement, let me upset some of you:
Eugene Stoner did not invent the gas impingement system that is the heart of the AR-15. In 1942, Sweden adopted the Ljungman rifle in 6.5 caliber. They did not replace all the bolt-action rifles in use, but simply added the Ljungman to each squad of riflemen as a means of increasing firepower. After the war, Sweden managed to entice the Danish armed forces into adopting a modified Ljungman, and even sold Egypt tooling and technical help in setting up their own manufacturing facilities. The armed forces of Egypt were at least sharp enough to insist in changing the rifle to 7.92 Mauser from the 6.5X55 of the Swedish model. The Ljungman was unique in having the direct-impingement gas system, which Stoner either copied or designed anew not knowing it existed. The Ljungman is still unique in the hazard it poses to users. When I was new to the gun business, I worked at a gun shop that specialized in surplus and collectible firearms. We’d see Ljungmans passing through the shop now and then, and my first exposure was to watch it being handled without touching it. You see, the bolt and carrier of the Ljungman are triangular in cross section, and there are no safety guards. You open the bolt by pushing the safety lever to ON
(I forget after all this time if that is to the left or right) grasping the cover and pushing it forward. At the forward end of its travel it locks onto the bolt, and retracts the bolt with it when you pull the whole bolt and cover assembly rearward.
Once the machinegun was invented, infantry tactics soon came to revolve around, and support, the machinegun. This is a West German MG-3, basically a WWII MG-42 rechambered in 7.62 NATO.
9780873499477_0010_002The M-16 in all its variations is a select-fire rifle. You can select Safe, Semi, Auto or Burst, depending on what version you have.
If there is a loaded magazine in place, when the bolt gets to the rear of its travel it snaps forward, chambering a round. If it is empty the bolt will stay back. If you go to close the bolt on an empty chamber, it snaps forward even faster. As there is nothing in the way of a dust cover or guard, if your hand or fingers are in the way, they’ll get snapped up too. You can get an M-1 Thumb
from a Garand, but you can lose a fingernail or even finger tip in a Ljungman.
The operation of the mechanism is simple, and familiar to any user of the AR-15: the gas is vented out of a port in the barrel, and travels directly down a tube to the face of the bolt carrier. There, the carrier is blown back, unlocking and taking the bolt with it. The design is simple, and uses fewer intricate and moving parts than other systems, save perhaps the Vorgrimmler delayed roller lock of the CETME and H-K systems.
The first section of the story begins in the late 19th century. The adoption of smokeless powder brings several revolutions: high velocity, greater firepower, and a lack of smoke. The result is that infantry can control more ground than before. The greater range allows a unit to project rifle fire to greater distances, and the lack of smoke allows for continued fire. In the years before the wholesale adoption of machineguns, infantry worked out methods of controlling and directing fire by units to impressive distances. The U.S. Army training manual of 1909 lays out the Army qualification process, with firing to 900 yards on moving targets. Target competition, which had always been a long-range sport with black powder rifles, stayed long with smokeless. The standard course for the National Matches requires firing at 200, 300, 500 and 600 yards. Other matches called for shooting to 1,000 yards or more.
At the end of WWII, many armed forces wished to upgrade their equipment. While it was prudent to continue using old gear during a war and not interrupt current manufacture and supply, once a war is over, no one wants to be stuck with the last war’s tools.
Contrary to that, the accountants will look at warehouses full of perfectly serviceable weapons, ammunition and support equipment, and ask What’s the advantage?
The advantage, hopefully, is to win the next war. However, you have to be fighting the right kind of war. What the Germans and Soviets found, and what the experts in the United States Army were not willing to admit, was that most combat took place at close range. While the rifles and machineguns used in WWII were designed and built to allow long-range engagements, well past 300 yards, experience showed that most combat was well within 300 yards. In fact, most of it was within less than 100 yards. S.L.A. Marshall debriefed units involved in the Korean War (Marshall has some critics, and there is much discussion of the validity of his data) and found that long-range rifle fire alone was not enough to stop Chinese units from maneuvering in the open. While all others armies were looking to develop rifles that would be best used within the close distances of actual combat, the U.S. Army insisted on the performance of the .30-06 cartridge. With the improvements of ball powder, they were able to shorten the cartridge and thus the .308 Winchester was born. We then forced the new cartridge onto our NATO allies, creating the 7.62X51, or 7.62 NATO
cartridge, a .308 designed for the rigors of combat.
The M-1 Garand, accurate and powerful, was the rifle all replacements were compared to. Except combat didn’t need a thousand-yard rifle any more.
9780873499477_0011_001The M-1 Carbine filled the same role the M-16 was first bought for. And also shared its history of insufficient development.
9780873499477_0011_002When the Army adopted the M-16, it already had the wretched M-60. It took almost 30 years, but the awful M-60 got replaced by the M-240, which is really the FN MAG-58. (Yes, 30 years to replace a bad design with one that was already in existence when we adopted the M-60.) The AR shows no signs of slowing down.
Any company or designer who wanted to sell rifles to the Army had to do so with designs that used the new 7.62 cartridge. So that is what the new Armalite company and Eugene Stoner did. The design took advantage of something old and something new, something borrowed and
….. well, there wasn’t anything blue in the AR-10. The something old was the Johnson eight-lugged bolt. Back when the Garand was struggling to be adopted, Melvin Johnson had a rifle and light machinegun that he thought was better. (I’ve owned and shot both, Melvin was wrong.) It used (and he patented) an eight-lugged bolt that locked into the back of the barrel. By using the barrel or a barrel extension as the locking location, the new rifle did not need a large, heavy steel receiver to take the stress of the cartridge pressure on firing. The something new was the gas impingement system, taken from the Ljungman. With the gas directed back via a small tube, there was no need for a long heavy operating rod or handle. By these two design changes alone, the Armalite rifle could be several pounds lighter than other designs. The something new was the use of new aluminum alloys as the receiver component. With new alloys, forged and machined, a receiver could be even lighter than a steel one, even one designed without the need to take the firing stresses, as a Garand receiver was designed to. And in the early years, the Garand was the comparator, as the AR-10 was new enough to be a design competitor to the M-14 and FAL.
To further reduce weight, Stoner and George Sullivan, in charge of ideas at Armalite, experimented with thin barrels that had aluminum jackets for stiffening and to aid in cooling the barrel. To reduce the felt recoil of the stout 7.62 cartridge in a light rifle (the prototypes weighed less than 7 pounds!) he designed muzzle brakes made of Titanium. However, newer is not always better, and even if it is, it isn’t always early enough. By the time the Armalite company and Stoner had worked the bugs out, and produced enough rifles to demonstrate they had something
the Army had already adopted the M-14. And our NATO allies had almost without exception adopted the FAL. The AR-10 found itself in a bad spot: Armalite had a manufacturer in Artillerie-Inrichtingen in Holland, and a few countries interested in buying it. But with the big players already committed to either the M-14 or the FAL, there were not many sales of the AR-10. A few hundred here, a few thousand there, not enough to keep the doors open, and production ceased in 1960. By that time, design changes and real-world requirements of durability had brought the weight up just past ten pounds, offering little advantage over the M-14 or FAL.
The rest of the world went with the FN-FAL in one form or another.
Eugene Stoner by then had taken a step back and started over again.
The government’s 30-caliber lightweight rifle program had been formal, ponderous and bureaucratic. The result was a rifle that satisfied no one except those in the program. (Hey, I love the M-14/M-1A platform, but given the choice between it and a bunch of other 30-caliber rifles with which to fight, I’ll take them.) Meanwhile, beneath the surface, there were other programs at work. One such program was in direct response to the lessons learned in WWII. To wit: High volumes of short-range fire were preferable to long-range fire. As a result, the Small Caliber High Velocity study produced the suggestion that a cartridge smaller than 7.62 could do the job. One result was the ill-fated SPIW program, which used flechettes as the projectiles. Trying to drive the firearms equivalent of a finishing nail to 4,000 feet per second or more proved technically impossible. But tests with M-1 carbines rebarreled to various .22 caliber wildcats proved promising. The SCHV program led to a requirement for a test rifle in .22 which was select-fire, 6 pounds in weight with at least 20 rounds of ammo in the magazine, and could penetrate a steel helmet or 10-gauge steel plate (.135") with a trajectory equal or better than the M-1, wounding as well as the M-1 Carbine, out to 300 yards. Not bad, eh? Unfortunately, as the requirements wound their way to Procurement, the range increased. First to 400 yards, then 500.
9780873499477_0012_002We adopted the M-14, an improved M-1 Garand in many respects, but still a rifle designed for long-range shooting.
9780873499477_0012_003The Germans adopted the CETME, and built a company, H-K, to build their new rifle, the G3 in the 1950s.
The result was a great deal of fussing over bullet weights and designs, and an increase in pressure to meet the new, excessive range requirements.
Stoner and Armalite had produced a scaled-down AR-10, chambered in .222 Remington. A brief aside here, on the nature of recoil. Newtonian physics tells us that you will have opposite and equal reactions to any force applied. Launching a bullet generates recoil. If the point of resistance of the impacted mass (that is, you) is below the center of mass of the recoiling object (that is, the rifle) the created lever pivots the rifle. The muzzle rises. If the point of resistance on the impacted mass is not on line with its center of mass the impacted mass will pivot. Thus, full-auto fire in a shoulder weapon causes the muzzle to rise and move to the right. You can fight it, but Sir Isaac Newton is working against you. Now, back to the Armalite prototype. Chambered in .222, with little recoil, and with the center of the bore straight through the stock, the minimal muzzle rise created was a sensation. Armalite had a request for more almost on the spot. They quickly produced rifles that the Army distributed for test and evaluation.
Meanwhile, Winchester was also working in a .22 rifle. Imagine a scaled-up M-1 Carbine, and you’d be on the right track. What killed the Winchester was the behind the scenes increase in the range requirement. While the AR-15 prototypes could be done in a cartridge (the .222 Special
) that could make the range, the Winchester couldn’t. They had the unenviable choice of either submitting a rifle that couldn’t make the range requirements, or using ammo that blew primers trying.
The SCHV tests in 1958 improved the design of the AR-15. In testing in the worst possible conditions the AR-15 prototypes produced stoppages at a third of the rate of pre-production .30 caliber rifles. But the fix was in, and a promising contender had to be scuttled or the Army might not get a new rifle at all. By 1958, we weren’t in any wars, and if the pronouncements of the U.S. Air Force and SAC were to be believed, all future wars would be nuclear, decided in our favor, and require only the equivalent of police and military police to restore order in the (glowing, radiation-saturated, barely habitable remnants) recently-devastated enemy territory. The AR was elbowed out, and the M-14 proceeded.
But the AR didn’t die, it simply went on tour. Armalite teamed up with Colt for further production of the AR-15. And the whole thing very nearly didn’t happen. You see, Colt back than was on life support. In 1959 there hadn’t been any new tooling installed in the 20th century except for wartime production. And none of that had been state-of-the-art when installed. Colt was strapped for money, and made old designs on old machines. They did manage to scrape up $75,000 to buy the rights to the AR-10 and AR-15 from Armalite, and even cut Armalite in for 4.5 percent of the profits of future sales. The tour was a success, especially the Southeast Asia stops. Many governments were interested in a rifle that was reliable, accurate, powerful, and better-suited to their short-statured troops than the M-1 Garands and BAR’s the U.S. government was interested in selling them. But the fly in the ointment was, the Armalite/Colt wasn’t in the U.S. arsenal, so no funding from defense loans could be used to buy them.
The solution came from the Air Force, beginning story Two. Each base needed security forces. The SAC bases, as they were our front line in the Cold War (just ask them) needed greater security. I don’t argue that a base with nuclear weapons stored in the bunkers needs tight security. Despite separating it self from the Army, the Air Force still used the weapons the Army had. The new M-14 was deemed too large and bulky, which left many base security personnel with M-1 and M-2 Carbines. Which the Army had phased out, and no longer had spare parts or support for. The end run
was to get the U.S. Air Force to adopt the AR-15, which got it into the supply line, and thus could be sold overseas. (Is this starting to sound like a Monty Python sketch to you, too?) The method? The same one arms makers had used for centuries: get the gun in the hands of someone who could approve a purchase. As arms makers went straight to President Lincoln in the Civil War, Armalite managed to get General Curtis LeMay to a party, where he fired an AR-15 and immediately wanted it to replace his SAC bases M-1 Carbines. Once the Air Force was on board, however, things spiraled out of control. Forced to consider the AR-15, the Army found itself in a quandary: if they cooked the books again (as they had the first time around) the AR-15 supporters would raise a huge fuss. And they’d be publicly screwing the Air Force on their prized new small arm. If they didn’t, the M-14 would suffer by comparison. As all this was happening, Defense Secretary McNamara was receiving conflicting reports as to which rifle was superior, just as he was reorganizing the Ordnance Department along the lines of what he considered an efficient procurement system to be. As part of the process, he eventually closed Springfield Arsenal, and was determined to depend on outside, civilian manufacturing for the development of small arms. The idea was that rather than have hidebound military officers trying to develop new weapons, he’d let industry do it, and select the best of the contenders after extensive testing.
Night combat does not require a long-range rifle. Most daytime combat doesn’t either. These Marines are training for what actually happens, not theoretical target-range shooting.
9780873499477_0014_001The Army insisted on the forward assist. The Air Force insisted on not having it. Since they bought more, the Army won.
McNamara, a brilliant man, had a great deal of faith in the ability of brilliant people. However, brilliant people without a solid base of experience can go astray much faster than less-brilliant people. The Department of Defense forced the Army into a one-time buy
of AR-15 rifles until the real solution, the SPIW, could be perfected. The SPIW used flechettes, and would be the high-tech solution to everyone’s problems. (We’re still waiting.) But then the whiz kids
made a mistake: they failed to look deeply into the matters of rifles, how they are made and how they are used. The whole messy problem can be summed up in two sentences: The demo rifle used on the Southeast Asia tour never failed. And no development engineering had been done since Stoners first efforts. The staff who were now doing the job that had been that of the Ordnance Department wanted more testing, development and engineering. The whiz kids
kept insisting that the Stoner rifle was perfect, needed no extra engineering, and felt the Ordnance types just wanted to get in and mess things up. They probably also looked at the M-14 program, which took a decade, spent millions of dollars, and produced a rifle marginally better than the rifle it replaced, the M-1 Garand.
The original sights were plenty good enough for combat. You can adjust the sight to zero it, but not fiddle with it on the target range.
9780873499477_0014_003The selector points towards the hole for the autosear pivot pin, which as been removed in this rifle. Removing it removes the ability to fire full-auto, but does not change the rifles legal definition: machinegun.
This time the Ordnance types were right. And so, a mere 20 years after the M-1 Carbine was rushed into production without testing and engineering study, we did the same thing with the AR-15.
And problems surfaced with embarrassing regularity. The rifle slam-fired, requiring a fix, which ended up being a simple process: make the firing pin lighter. The accuracy was sometimes not very good. That was traced to the rifling twist, a source of controversy to this day. The original twist rate was one turn in 14 inches (marked or denoted as 1/14
) the 1/14 twist was fine for a .222 Remington. But in the newly-designated .223 Remington, with a slightly heavier bullet at a higher velocity, it was marginal. So marginal that in Arctic weather the extra density of the cold air was enough to cause accuracy problems. Accuracy problems is perhaps understating things: in cold weather, a slightly worn rifle with a 1/14 barrel can’t keep all its shot on a man-sized target at 100 yards. Volume is good, but there has to be some accuracy, or volume is for naught. The solution was to speed up the rate to 12 inches (1/12) but then the buzzsaw
on impact effect apparently disappeared. Or didn’t, depending on who you talk to.
The Swiss waited a long time to adopt the 5.56mm, for they actually did have a need for long-range accurate fire, and weren’t going to give up their 7.62mm rifles until the 5.56 could deliver at 300 meters. This Sig 552 is capable of first-shot hits at 300 meters.
The ammunition also came in for development and controversy. The original .222 Special
specifications hadn’t been changed (nor worked on) since 1958, but in 1963 when the AR-15 was being adopted the whiz kids again deemed it perfection, since Stoner had personally designed it. Despite this perfection
there was a scramble to perfect bullet shapes for the best long-range
performance (long-range for the AR-15 being deemed 500 yards) and for a suitable powder to drive it. One fateful change that was made was in the powder. Since DuPont could not supply the IMR powder needed to load the new .223 Remington in the kind of volume a shooting war requires, the whiz kids at DoD approved the use of Ball powder. The two problems with the ball powder selected were that its burning rate differed from the IMR powder, and no one bothered to check the formulation of the flash suppressant.
Any gas-powered firearm needs to use powder with a certain burning rate. Just like an automobile (for a cartridge is a specialized internal combustion engine) you have to give it what it needs. If you do not, the rifle will suffer. This was known even in 1963, for if you fed an M-1 Garand ammo loaded with the wrong powder you could bend the operating rod. A fired cartridge reaches a peak pressure quickly, and the powder then burns and expands down the bore, pushing the bullet ahead of it. A progressive
powder does not reach as high a peak as quickly, and keeps pushing (retains residual pressure at a higher level) the bullet. Ball powders of the time were more progressive than the IMR powder selected for the AR-15. A progressive powder thus has the bullet passing the gas port with a higher pressure behind it, feeding more gas to the system. In the AR-15, that meant a higher impulse delivered to the bolt carrier. Colt could not deliver rifles within mil-spec using ammunition loaded with the selected ball powder. The cyclic rate allowed by spec was approximately 750 rpm. Firing ammunition loaded with ball powder, M-16s would run at 900 rpm. To solve
the problem, the spec was temporarily re-written to allow up to 900 rpm in full-auto fire.
We still see today that the AR is powder-sensitive. If you reload, and use a powder that burns too quickly (a fast powder
in the parlance) the rifle will short-stroke, and fail to function. Using a powder that burns too slowly will push the pressure curve down the bore, increase port pressure, and work the action too hard. You want the firearms equivalent of the middle bowl of porridge.
As for the flash suppressant, military use calls for a powder that offers less muzzle flash than other applications. As a result, the 7.62 NATO round was loaded with powder that had 2 percent of calcium carbonate in the mixture. The AR-15, with the gas blown back into the receiver, couldn’t work for long with 2 percent. But it wasn’t until soldiers were dying in a place called Vietnam that anyone thought to check that little detail. Then, we found out the .223 was relatively non-flashing, and the AR-15 reliable, with half a percent of calcium carbonate. The fouling and high cyclic rate were compounded by the history of the AR; it had been touted as the rifle that didn’t need cleaning.
Something GIs would believe, since when the rifles arrived in Vietnam there were no government .22 caliber cleaning rods in the system. With few rods, few chamber brushes, fouling cartridges and the high-humidity Vietnam environment; the miracle isn’t that so many rifles malfunctioned, but that so few did.
So, we started Vietnam with two rifles: a 7.62 long-range rifle unsuited for use in the jungle, and a small-caliber bullet hose that wasn’t reliable unless you kept it clean, fed it good ammo, and tested your magazines. So guess what happened? When it came time for volume production, we went with the bullet hose, but didn’t bother cleaning it, getting good ammo, or good magazines. At least not for the first couple of years. So much for the brilliant whiz kids.
Vietnam
There are two groups of Vietnam vets: those who had reliable M-16s, and those who didn’t. Without casting aspersion on either group, generally the former were those who kept their rifle clean, and the latter were not. But not all M-16s worked even when clean. And not all dirty ones failed. Such was the appalling lack of development that went into the M-16.
The standard
M-16 of the Vietnam War was the M-16 or the M-16A1. It had a solid stock, 20-inch, skinny barrel with a 1/12 twist, and triangular handguards. I’ve seen, handled and shot a bunch of them. The only ones that failed me did so because someone earlier in the ownership stream had neglected maintenance. But then, I never dragged them through swamps, either. The standard cartridge was the M-193, a 55-grain boat-tail bullet at something over 3,100 fps. Many hate it for its failure to stop bad people from doing bad things. Others found no fault with it. I’ve had more than one combat vet tell me he never saw the M-16 fail to put an enemy soldier down. Everyone I ever saw shot with an M-16 dropped, and was DRT.
(Dead Right There.) Is a commonly-recited experience.
A Colt Commando the result of letting the end-user design a weapon: light, handy, and kept clean, plenty reliable for jungle combat. Just don’t expect much terminal effect past 200 meters.
9780873499477_0017_001Armalite is making the AR-180 again, with some updates. In some ways it is better than the AR-15, in other ways not.
9780873499477_0017_002The new AR-180 uses AR-15 magazines without the need to modify the mag tube, as was the case with the old AR-18 and AR-180.
But the little 55-grain bullet had shortcomings. One, it failed to penetrate chance obstacles except at close range. And it lacked long-range accuracy. So once the war was over, and things got more or less back to normal (except for gas shortages, stagflation and disco) the various branches of our armed forces looked to improve the M-16. And we got the M-16A2.
While that was going on, Armalite found themselves out of the market: they’d sold the rights to Colt, and the AR-15 took off. So they went back to the drawing boards (Armalite then being an idea company, not a manufacturer) and came up with the anti-AR
the AR-18. Instead of aluminum forgings, it used sheet metal steel stampings. Instead of direct gas impingement, it used a captured operating/gas rod. It used the same rotary bolt, and the