A powder and shot separator of a shallow cup design which when loaded with lips down acts to help seal powder gases and so protect the rear of the shot column.
Checkering which is cut with a tool into the surface, either by hand or machine, rather than impressed.
A choke formed by a reamer during manufacture of the barrel of a shotgun.
A generally circumferential separation in the side wall of a cartridge case. May be complete or partial.
A process of forming the spiral grooves in the bore of a rifle barrel by a cutting tool which has a hook shape. Also called Hook Rifling.
The rate which a succession of movements repeats itself; in an automatic firearm, it is usually expressed in shots per minute that are theoretically possible to be fired, given an unlimited supply of ammunition.
The act of chambering a cartridge, firing the cartridge, opening the action, ejecting the spent cartridge case, and loading the next cartridge if applicable.
The rotating part of a revolver that contains the cartridge chambers.
The relationship of the axis of the chamber in a revolver cylinder to the axis of the bore.
A shotgun barrel with a uniform interior diameter forward of the forcing cone to the muzzle end of the barrel.