Archives: Glossary

A radial rupture of the head and rim of a rimfire cartridge or shotshell.

The part of a solid frame revolver on which the cylinder is swung out to accomplish loading and ejecting.

A trigger that releases without sensible movement.

A type of manual firearm safety operated by a lateral force on a button usually located in the trigger guard. Also called Push-Button Safety.

1. A transverse operating type of lock used in some break-open type firearms (sometimes called a “Greener Crossbolt”). 2. A device intended to prevent stock splitting due to recoil. 3. A form of manual safety which operates transversely to prevent or permit firing of a gun.

The generally irregular grain pattern common to a stock blank cut from the crotch of a tree.

A feature on the muzzle of the barrel that is concentric and perpendicular to the bore axis. The purpose is to promote accuracy and protect the rifling at the muzzle.

The act of applying a crown.

A calibrated metallic cylinder that, when used in conjunction with specific associated equipment, measures chamber pressure or firing pin indent.

A pressure value determined by means of copper crusher cylinders using SAAMI recommended procedures and equipment.