Abstract: A revolver having a barrel and a cartridge cylinder. The barrel has a rifled barrel bore, a barrel throat, and an entrance into the barrel throat. The barrel throat is located at a rear end of the barrel bore and has a general cone shape. The entrance is located at a rear end of the barrel throat and has a uniform constant diameter. The rear end of the barrel can be reduced to adjust a gap between the rear end of the barrel and the cylinder without having to re-work the barrel throat.

Abstract: A semi-automatic pistol (10) has a breech-slide (14) for chambering a cartridge (32). The breech-slide carries an inertia type firing pin (18) which is displaced to fire the chambered cartridge by a hammer (26). An axially movable trigger assembly (42) functions to displace a sear (34) to release the hammer when the trigger assembly is moved to the pulled position. The hammer has a safety surface (46) which performs the function of a half-cocked notch but engages the sear near the fired position so that a falling of the hammer after disengagement of the sear and the safety surface will not cause the firing pin to fire a cartridge. A firing pin lock (20) is mounted in the breech-slide for vertical movement between a lower pin-locking position and an upper position in which the pin is free to travel. A pair of operatively interconnected levers (70, 76) respond to movement of the trigger assembly to the pulled position and simultaneously move the lock to the upper position.