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.
Letter: L
LUP (LEAD UNITS OF PRESSURE)
(Obsolete) A pressure value determined by means of lead crusher cylinders.
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.
LOADING DENSITY
The relationship, in a cartridge, of the volume of the propellant to the available case volume. Usually expressed as a percentage.
LOW BRASS
Common terminology referring to the length of the external metal cup on a shotshell.
LOADING GATE
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.
LOW CUP
Correct term for shotshells having a low metal head type of construction.
LOADING PORT
The opening in a receiver where a cartridge may be placed in the firearm either directly into the chamber or the magazine.