Mk 19 grenade launcher
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The Mk 19 grenade launcher is an American 40 mm belt-fed automatic grenade launcher that was first developed during the Vietnam War.
A Mk 19 40 mm grenade launcher mounted on an M3 tripod
US Navy crewman fires a Mk 19 Mod 0 in July 1969
U.S. Navy sailors fire a Mk 19 40 mm grenade launcher during a training exercise in March 2003.
Mk 19 in use by Polish Land Forces
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 propellant charge.
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.
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
Operation of the Schwarzlose machine gun.