A
- A-MAX
- A303 (Beretta shotgun)
- ABC’s of reloading, The
- absorber, recoil
- accelerator
- accuracy
- accuracy life
- accurize
- ACP
- action
- action bar
- action bar flat
- action bar lock
- action tuning
- action, autoloading
- action, automatic
- action, Ballard
- action, barreled
- action, blow-forward
- action, blowback
- action, bolt
- action, boxlock
- action, break-open
- action, delayed blowback
- action, double
- action, dropping block
- action, falling block
- action, hinged frame
- action, lever
- action, lever (Henry rifles)
- action, locked breech
- action, open breech
- action, pivoting block
- action, recoil operated
- action, retarded blowback
- action, rolling block
- action, semiautomatic
- action, side lock
- action, simple blowback
- action, single
- action, single shot
- action, slave
- action, slide
- action, sliding block
- action, straight pull bolt
- action, stripped
- action, tip-up
- action, top-break
- action, trapdoor
- action, turn-bolt
- action, under-lever
- actuator
- adapter
- Advanced Manufacturing Process bullet jacket
- AECA
- aim
- aiming point
- Aimpoint
- air gauge
- air gun
- air resistance
- air space
- air spiral
- alloy no. 210
- alloy no. 220
- altitude effect
- Amateur Trap Association
- American Gunsmith
- American Gunsmithing Association
- American Tactical (manufacturer)
- American Tactical Imports (manufacturer)
- ammunition
- ammunition code number
- ammunition color code
- ammunition lot
- ammunition, ball
- ammunition, fixed
- ammunition, live
- ammunition, match
- ammunition, match grade
- ammunition, metallic
- ammunition, National Match
- ammunition, reference
- ammunition, service
- ammunition, small arms
- ammunition, sub-caliber
- AMP jacket
- angle of departure
- angle of elevation
- anneal
- annulus
- ANSHÜTZ 151 Deluxe (rifle)
- Anson fastening fore-end
- antimony
- anvil
- AP
- aperture sight
- arm
- Arms Export Control Act
- arms, small
- armor-piercing bullet
- assembly
- ATA
- ATF
- ATF DIO
- ATF Director of Industry Operations
- ATF Firearms Technology Branch
- ATF FTB
- ATF regulation
- ATF ruling
- ATI (manufacturer)
- auto
- autoloader
- autoloading
- autoloading action
- automatic
- automatic action
- automatic Colt pistol
- automatic feed mechanism
- automatic fire
- automatic pistol
- automatic rifle
- automatic safety
- auxiliary cartridge
- auxiliary chamber
- axis of bore
- axis pin