All A Brands
- A-Zoom
- AB Suppressor
- Adams Arms
- Adaptive Tactical
- Advanced Technology International (ATI)
- Advantage Arms
- Aero Precision
- Agency Arms
- Aguila Ammunition
- Aimpoint
- ALG Defense
- Alien Gear
- Allen Company
- Allen Engineering
- American Defense ADM
- American Precision Arms
- American Precision Firearms (APF)
- AmeriGlo
- Ammunition Storage Components
- Angry Bear Arms
- Angstadt Arms
- Apex Tactical Specialties
- Armalite
- Armaspec
- Armscor
- Atlas Gunworks
- ATN Corporation
- Auto Ordnance
