Locked Breech

(lŏk)                         (brēch)

A firearms action in which the barrel and breechface remain locked together during the initial part of the firearm's discharge. Most powerful auto pistols use the locked-breech principle; most low-powered ones are blowbacks. Recoil operation is an operating mechanism used in locked-breech, autoloading firearms. As the name implies, these actions use the force of recoil to provide energy to cycle the action.

Locked Breech Pistol
Locked Breech Pistol