Letter: D

An acronym for DEactivated WAr Trophy.

To cause a firearm to fire.

A device intended to disengage the sear from the trigger. 1.) In a manually operated firearm, it is intended to prevent firing without pulling the trigger. 2.) In a semiautomatic firearm, it is intended to prevent full automatic firing. 3. A device that prevents out-of-battery firing.

Bullet that breaks into small pieces in flight or upon impact with the target.

A projectile that breaks up after leaving the muzzle and before it hits the target.

An electronic pulse forming device used in measuring projectile velocities.

The greatest distance between any two bullet holes on a target, normally measured center-to-center.

A barrel formed by twisting or braiding together steel and iron wires or bars. The resulting cable is then wound around a mandrel and forged into a barrel tube. Sometimes called a Laminated Barrel.

A blow back action that utilizes a sliding weight, usually made of a dense material such as tungsten, in conjunction with the breechblock to counteract the effect of the breechblock inertia and retard the cyclic rebound rate of the breech block.

A reference plane, point or diameter that provides a base for calculations and measurements.