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Glossary Results

L - 62 matching terms

LAND DIAMETER
See Bore Diameter.

LAND, LANDS
The uncut surface of the bore of a rifled barrel.

LANYARD
A strap or cord that is attached to a firearm (usually handgun) and worn around the neck or shoulder to prevent loss of the firearm.

LAP, LAPPING
The process of polishing a metal surface such as the interior of a barrel with a fine abrasive substance.

LATCH
A movable device used to secure a part or piece in place relative to another. As applied to firearms, various types of latches are employed to hold barrels, cylinders, etc., in position and to enable these parts to be moved for loading, unloading and disassembly.

LEADE (LEAD)
That section of the bore of a rifled gun barrel located immediately ahead of the chamber in which the rifling is conically removed to provide clearance for the seated bullet. Also called Throat or Ball Seat.

LEADING
The accumulation of lead in the bore of a firearm from the passage of lead shot or bullets. Also called Metal Fouling.

LEAF SIGHT
See Sight, Folding.

LENGTH OF STOCK
See Stock, Length Of.

LENGTH, OVERALL
1. Firearm: The dimension measured parallel to the axis of the bore from the muzzle to a line at right angles to the axis and tangent to the rearmost point of the butt-plate or grip.
2. Ammunition: The greatest dimension of a loaded cartridge, i.e., from face of the head to the tip of the bullet for centerfire or rimfire or to the crimp for shotshells or blanks (not to be confused with the uncrimped length in a shotshell.)

LEVER
A projecting piece used to operate a mechanism, as the lever of a lever action firearm. See also, Action, Lever.

LEVER ACTION
See Action, Lever.

LEVER LOCK
A device intended to hold the lever closed on some lever action guns.

LEVER, COCKING
A mechanical means of cocking the hammer or striker of some firearms using a manually operated, external lever.

LEVER, OPERATING
On lever action firearms that part operated by the hand to open and close the breech.

LEVER, REBOUND
A rotating device designed to move the hammer into a position in which there is no contact of either hammer and firing-pin or firing-pin and primer. It may also be used to position a safety device between the hammer and firing-pin or primer.

LIFTER
See Carrier.

LIFTER PAWL
See Dog, Carrier.

LINE ENGRAVING
A form of engraving in which the entire pattern or design consists of shallow line cuts as opposed to engraving done in bas-relief. This type of engraving is often found on the metal parts of firearms.

LINE OF BORE
See Bore Axis.

LINE OF DEPARTURE
The direction in which a projectile is moving when it leaves the muzzle of a firearm. Also defined as the tangent to the trajectory at the muzzle. See Trajectory.

LINE OF SIGHT
See Sight, Line Of.

LINK
A part that connects two other parts, while permitting flexibility between the parts.

LINKAGE
A connection between parts used to transmit motion from one to the other.

LIVE AMMUNITION
See Ammunition, Live.

LOAD
1. The combination of components used to assemble a cartridge or shotshell.
2. The act of putting ammunition into a firearm.

LOAD, BRUSH
A shotshell load specifically designed to provide a widely spread pattern at a close range in a choked gun. Also called Spreader Load, Scatterload, Bush Load, Thicket Load.

LOAD, DUPLEX
1. A cartridge case containing two projectiles with a single powder charge.
2. A cartridge case containing a single projectile with two types of powder.

LOAD, FIELD
A shotshell loaded for hunting small game animals and birds.

LOAD, PRESCRIBED
For every caliber of metallic cartridge and the numerous bullet weights used in each, and for each shotshell gauge or bore, and the various shot weights loaded in each, a particular combination of components should be used. Collectively, the correct components for any given cartridge or shell may be referred to as the prescribed load.

LOAD, PROOF
See Cartridge, Definitive Proof.

LOAD, SERVICE
Commercially loaded, sporting ammunition, intended to meet the full service requirements of the targeted consumer.

LOAD, SQUIB
A cartridge or shell which produces projectile velocity and sound substantially lower than normal. May result in projectile and/or wads remaining in the bore.

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

LOADING GATE
See Gate, Loading.

LOADING PORT
See Port, Loading.

LOADING RAMP
See Ramp, Loading.

LOCK
A general term referring to the total firing mechanism in a firearm. Range command sometimes used to indicate engagement of a manual safety (“Lock you firearms”). An externally applied device intended to help secure a firearm.

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

LOCK FRAME
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.

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

LOCK, REBOUNDING
A type of firing mechanism, wherein the hammer or striker after forward movement retracts slightly to a rest position.

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

LOCKING BLOCK
See Block, Locking.

LOCKING BOLT
See Block, Locking.

LOCKING CAM
See Cam, Locking.

LOCKING LUG
See Bolt Locking Lug(s).

LONG GUN
See Shoulder Arm.

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

LOW BASE
See Base, Low.

LOW BRASS
See Brass, Low.

LOW CUP
See Cup, Low.

LUG
See specific type. Example, Locking Lug.

LUG, BARREL
A general term for any projection extending at right angles to the barrel.

LUG, BOLT
See Bolt Locking Lug(s).

LUG, LOCKING
See Bolt Locking Lug(s).

LUG, RECOIL
A block or plate on the bottom of a receiver and/or barrel to transfer the recoil to the stock.

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

LUMP, CHOPPER
A type of lump which is integral with the barrel. See Lump.

LUMP, HOOK OF
A notch machined into a lump used to mate with the hinge pin.

LUMPS, BIFURCATED
A type of lump found mainly on expensive over/under shotguns. The bifurcated or divided lumps are mounted on each side of the lower barrel, as opposed to under it, which serve to reduce the overall height of the receiver-barrel assembly.

LUP (LEAD UNITS OF PRESSURE)
Pressure value determined by means of lead crusher cylinders.

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