Letter: L

(Obsolete) A pressure value determined by means of lead crusher cylinders.

One of several projections located on the underside of the barrel or barrels on break action guns, which serves to secure the barrels to the action or receiver. See Barrel Lug.

An incline, either helical or straight, to assist in closing the action on a chambered cartridge.

The relationship, in a cartridge, of the volume of the propellant to the available case volume. Usually expressed as a percentage.

1. Revolvers: A hinged piece attached to the frame which is opened to permit loading. 2. Shoulder Arms: A spring loaded cover for the loading port.

The opening in a receiver where a cartridge may be placed in the firearm either directly into the chamber or the magazine.

A platform or cut placed in the bottom of the receiver that aids in guiding a cartridge into the chamber as the action is closed.

1. A general term referring to the total firing mechanism in a firearm. 2. Range command sometimes used to indicate engagement of a manual safety (“Lock your firearms”). 3. An accessory intended to help secure a firearm from unauthorized use.

The amount of energy delivered to the primer from the firing-pin blow.

A device incorporated into the mechanism of some firearms where the barrel and the bolt assembly recoil upon firing. The lock frame acts to absorb the shock of the recoiling parts prior to the bolt unlocking and opening.