B
- back strap
- back-bore
- backstop
- backthrust
- Bacon, Roger
- Baker bore
- balance
- ball
- ball ammunition
- ball screw
- ball seat
- ball, patched
- Ballard action
- Ballard, Charles Henry
- balled shot
- ballistic coefficient
- ballistic curve
- ballistics
- ballistics, exterior
- ballistics, interior
- ballistics, terminal
- band
- bar sight
- barrel
- barrel arrangement
- barrel assembly
- barrel band
- barrel blank
- barrel broach
- barrel channel
- barrel corrosion
- barrel diameter
- barrel erosion
- barrel insert
- barrel length
- barrel liner
- barrel lug
- barrel measurement
- barrel obstruction
- barrel pressure
- barrel reflector
- barrel relining
- barrel shank
- barrel step
- barrel striking
- barrel swaging
- barrel threads
- barrel time
- barrel vent
- barrel vibration
- barrel walking
- barrel wear
- barrel whip
- barrel-cylinder gap
- barrel, bulged
- barrel, bull
- barrel, Damascus
- barrel, fluted
- barrel, laminated
- barrel, Mann
- barrel, pressure
- barrel, ringed
- barrel, test
- barreled action
- base pin
- base, high
- base, low
- base, split
- BATF
- BATFE
- BATFE Firearms Technology Branch
- BATFE FTB
- battery
- Baughman front sight
- Baughman, Frank
- Baughman, Thomas Frank
- bbl
- BCM
- bearing surface
- bedding
- Benchmade Infidel (knife)
- Benchmade Mini Infidel (knife)
- Benchmade Pagan (knife)
- Benelli USA
- Beretta Model 70 (pistol)
- Beretta Model A303 (shotgun)
- berm
- big bore
- black powder
- blue, cold
- blueprinting
- bore
- bore axis
- bore reflector
- bore, Baker
- bore, big
- Bowen Classic Arms Corp.
- brass, high
- brass, low
- Bravo Company MFG
- Brownell, Bob
- Brownell, Frank R., III
- Browning .22 Semi-Automatic (rifle)
- Browning A-Bolt (rifle)
- Browning Citori (O/U shotgun)
- Browning Hi Power (pistol)
- Browning Superposed (O/U shotgun)
- Browning, John Moses
- John M. Browning Firearms Museum
- Browning X-Bolt (rifle)
- bulged barrel
- bull barrel
- bullet, armor-piercing
- bullet, full metal case
- bullet, full metal jacket
- bullet, full patch
- bullet, full-jacketed
- Bureau of Alcohol, Tobacco, Firearms, and Explosives