Letter: D

Lead shot having a nominal diameter of .040” or smaller.

1). A cover over the ejection port of a firearm to reduce the possibility of the entrance of foreign matter into the action. 2). The forward part of a pistol frame which protects the recoil spring.

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.

An inert cartridge which cannot be fired under any circumstances. In America, an inert cartridge for gun functioning is usually black oxidized and may or may not have holes in the side wall of the case. An inert cartridge for display may be natural colored and should have a hole in the primer cup with holes in the side wall of the case optional.

An obsolete term referring to an expanding bullet manufactured at the British Arsenal in Dumdum, India around 1900.

The practice of “firing” a firearm without the use of live ammunition.

One that is separated completely from the cartridge or shotshell after firing without obvious distortion of the primer pocket and head.

A firing mechanism in which the trigger serves the dual purpose of cocking and then releasing the firing mechanism – either hammer or striker. Double action only (DAO) firearms cannot be manually cocked to emulate single action mode. For differentiation, see Single Action and Double Action.

A firing mechanism in which the trigger serves the dual purpose of cocking and then releasing the firing mechanism – either hammer or striker. Double action firearms can be manually cocked similar to single action mode. For differentiation, see Single Action and Double Action Only.

A pistol mechanism in which a single pull of the trigger cocks and releases the hammer.