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The Heckler & Koch P9S is a military and police pistol using an unusual breech locking system derived from the company’s highly successful G3 assault rifle. The roller locking system for the breach relies on a two-part breech block which is held close by two small rollers which engage in recesses in the barrel extension. The rollers are carried on the forward, lightweight, portion of the block which is actually the part of the slide. When the pistol is fired, the light portion, impelled by the pressure on the cartridge case, attempts to move backward, but the inertia of the slide keeps the rollers forced outwards and the block section locked to the barrel. I hope you like the video and please don’t forget to like and subscribe! Thanks!