Blowback (firearms)
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Blowback is a system of operation for self-loading firearms that obtains energy from the motion of the cartridge case as it is pushed to the rear by expanding gas created by the ignition of the propel
The .380 ACP Colt Model 1903 Pocket Hammerless uses simple blowback. The mass of the slide is enough to delay opening of the chamber until pressure has dropped.
7.62x51mm NATO rounds from a delayed blowback firearm. Note the scorch marks from the fluted chamber
Cutaway model of the chamber with gas relief flutes (left) and roller-delayed action of the G3 battle rifle
Exploded view of primary components for bearing delay bolt carrier group
Heckler & Koch G3
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The Heckler & Koch G3 is a select-fire battle rifle chambered in 7.62×51mm NATO developed in the 1950s by the West German firearms manufacturer Heckler & Koch, in collaboration with the Spanish state-
Blowback (firearms)
…centralizing the main moving parts into the receiver. Because of high pressures, rifle-caliber delayed blowback firearms, such as the FAMAS, AA-52 and G3, typically have fluted chambers to ease extraction. Below are various forms of delayed-blowback actions: Roller-delayed blowback was first used in…
Field-stripped G3A3 rifle showing its modular design
HK G3 Bayonet with scabbard