Terms that start with D

A disconnector is a safety feature on a semiautomatic firearm which is present in order to prevent a second cartridge from being automatically fired.

Double action is often found on revolvers and is a type of action where the pulling of the trigger causes the gun's cylinder to turn, cocks the hammer, and fires the gun.

A double rifle is the joining of two rifles together on one frame which then allows for instantaneous shots to be fired.