LOCK PLATE

A metal plate mounted on the stock of a gun to provide for mounting of, or access to, the firing mechanism.

LOCKED BREECH ACTION

An action in which the breech bolt is locked to the barrel or receiver, until unlocked through a mechanical process.

LOCKING BLOCK

The firearm component designed to secure the action in the locked position.

LOCK-TIME

The time interval between sear release and the firing-pin striking the primer.

LONG RIFLE

1. Originally, the term was used in reference to long-barreled flintlock rifles. 2. The name given one type of a caliber 22 rimfire cartridge.

LOOSE PRIMER

A primer which does not fit properly in the primer pocket of a cartridge case or shotshell.

LOT OF POWDER

A homogeneous blend of powder having defined chemical and physical properties, as well as performance characteristics.

LOW BASE

A term commonly applied to a shotshell with a low metal cup, but properly applies to the height of the internal base wad. Often misused as synonymous with low brass or low cup.

LOW BRASS

Common terminology referring to the length of the external metal cup on a shotshell.

LOW CUP

Correct term for shotshells having a low metal head type of construction.