- 17 Design & Mfg
- 2A Armament
- 3M/Peltor
- A-Zoom
- ACE
- Action Target
- Advanced Technology
- Advantage Arms
- Aero Precision
- Agency Arms
- Aguila
- Aguila Ammunition
- Aguilar Ammunition
- ALG Defense
- Alien Gear Holsters
- Allen
- Alpha Precision Works
- Alpha Shooting Sports
- Amend2
- American Tactical
- Ameriglo
- Ammo Inc
- Anderson Manufacturing
- Angry Bear
- Angry Bear Arms
- Angstadt Arms
- Apex Tactical Specialties
- AR Maglock
- Arcane Tactical
- Armaspec
- Armscor
- ASC
- Atibal
- ATS
- B5 Systems
- Ballistic Advantage
- Barnaul
- Barnes
- Bastion
- Battle Arms Development
- BCA
- BCM Gunfighter
- Bear Creek Arsenal
- Belom
- Benelli
- Beretta
- Bersa
- Birchwood Casey
- Black Rain Ordnance
- Blackhawk