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In firearms, a blowback system is generally defined as an operating system in which energy to operate the firearm's various mechanisms, and automate the loading of another cartridge, is derived from the inertia of the spent cartridge case being pushed out the rear of the chamber by rapidly expanding gases produced by a burning propellant, typically gunpowder. [3]
According to Newtonian mechanics, if the gun and shooter are at rest initially, the force on the bullet will be equal to that on the gun-shooter. This is due to Newton's third law of motion (For every action, there is an equal and opposite reaction). Consider a system where the gun and shooter have a combined mass m g and the bullet has a mass m b.
Blow forward (left) vs. blowback (right) operation. The Mannlicher M1894 pistol, the first blow-forward firearm.. Blow forward is a firearm action where the propellant gas pressure and the friction of the bullet traveling down the bore drag the whole gun barrel forward to facilitate the opening of the breech. [1]
Submachine gun: 2017 CMMG Banshee CMMG 9×19mm.40 S&W.45 ACP FN 5.7×28mm 10mm Auto United States Semi-automatic pistol: 2021 MP-A2: A Squared Armament 9x19mm Parabellum United States Submachine gun: 2020 NPC-9: 9x19mm Parabellum United States Submachine gun: 2020 PGS15: Preppers Gun Shop MFG: 9x19mm Parabellum United States Submachine gun: 2020
Blowback firearms sometimes lack an extractor as they really aren't necessary for this method of operation. Delayed blowback This action is found where recoil is light enough that a fully locked breech is not necessary. Like simple blowback, it is case movement that opens the breech. This is a more robust version of simple blowback.
List of firearms. List of assault rifles; List of battle rifles; List of blow forward firearms; List of bolt-action rifles; List of bullpup firearms; List of carbines; List of delayed blowback firearms; List of grenade launchers; List of machine guns; List of multiple-barrel firearms; List of pistols; List of recoilless rifles; List of ...
Simple blowback action is simple and inexpensive to manufacture, but is limited in the power it can handle, so it is seen on small caliber weapons such as machine pistols and submachine guns. Lever-delayed blowback, as seen in for example the French FAMAS assault rifle, can also handle more powerful cartridges but is more complicated and ...
The Calico Liberty is a roller-delayed blowback-operated semi-automatic rifle (Liberty II) or pistol (Liberty III) chambered for the 9 mm Parabellum. These firearms use an unusual 50- or 100-round helical magazine that allow for a large number of rounds in a relatively compact and convenient package.