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Gun, weapon consisting essentially of a metal tube from which a missile or projectile is shot by the force of exploding gunpowder or some other propellant. In military science, the term is often limited to cannon larger than a howitzer or mortar, although these latter two types, like all tube-fired artillery pieces, also fall within the general definition of a gun. Guns also include such military small arms as the musket, rifle, machine gun, and pistol, as well as such nonmilitary sport firearms as the shotgun. Bazookas and other rocket launchers, which launch self-propelled projectiles, are not guns, though they perform many of the same functions. (See also military technology.)Schwarzlose machine gun, early Austrian water-cooled machine gun (q.v.) operating on the blowback principle. A heavy breechlock and spring hold the bolt closed until the pressure has been reduced to a safe level.
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Then the fired cartridge case and bolt are blown to the rear against the main spring.Automatic rifles should not be confused with semiautomatic rifles, as the latter fire only one shot at each pull of the trigger. An automatic rifle fires repeatedly as long as the trigger is held down, until the magazine is exhausted. That fully automatic firing is achieved by weapons such as the machine gun and submachine gun. In some models of assault rifles, fully automatic fire can be substituted for one-shot or three-shot burst fire by flicking a switch on the weapon. Most modern infantry rifles are assault rifles or carbines with fully automatic or burst fire capabilities.Gatling gun, hand-driven machine gun, the first to solve the problems of loading, reliability, and the firing of sustained bursts. It was invented about 1862 by Richard Jordan Gatling during the American Civil War.