Letter: B

The pressure in a barrel developed by propelling gases when a cartridge is fired.

Also called bore reflector. A device with a mirror for examining the bore and chamber of a barrel.

The replacement of the interior surface of a bore by inserting and fastening a tube. Usually refers to rifled barrels.

The breech end of the barrel that fits into the action or receiver.

This term usually refers to shotgun barrels. See Barrel Relining.

An abrupt change in external barrel contour.

The longitudinal hand filing of a barrel on its exterior surface to produce a smooth finish.

1. Threads found on the breech of the barrel, used to screw some barrels into the frame or receiver of the firearm. 2. Threads found on the muzzle end of the barrel, used to attach a muzzle device

The elapsed time from the contact of a firing-pin with a cartridge primer to the emergence of the projectile(s) from the muzzle of the firearm.

An opening or series of openings or ports in a barrel, normally near the muzzle, through which gases pass prior to bullet exit. See Muzzle-Brake.