Gatling gun
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The Gatling gun is a rapid-firing multiple-barrel firearm invented in 1861 by Richard Jordan Gatling. It is an early machine gun and a forerunner of the modern electric motor-driven rotary cannon.
1876 Gatling gun kept at Fort Laramie National Historic Site
Mitrailleuse Gatling modèle APX 1895
A British 1865 Gatling gun at Firepower – The Royal Artillery Museum
Patent drawing for R. J. Gatling's "battery gun", 9 May 1865
Firearm
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A firearm is any type of gun that uses an explosive charge and is designed to be readily carried and used by an individual. The term is legally defined further in different countries.
The Colt Single Action Army, a revolver chambered in .45 Colt
The Glock 19, a pistol chambered in 9×19mm Parabellum
The Mosin–Nagant, a rifle chambered in 7.62×54mmR
The M4 carbine, a carbine derivative of the M16 rifle, chambered in 5.56×45mm NATO