Semi-automatic firearm

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The M1 Garand. the first semi-automatic rifle to be generally issued to the infantry in any nation.

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Remington 1100 Tactical Shotgun in 12 gauge - an example of a semi-automatic shotgun

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Walther P99, a semi-automatic pistol from the late 1990s

A semi-automatic, or self-loading firearm is a gun that requires only a trigger pull for each round that is fired, unlike a single-action revolver, a pump-action firearm, a bolt-action firearm, or a lever-action firearm, which require the shooter to manually chamber each successive round. Also, unlike a double-action revolver, power from one shot is used load the next, instead of using power from pulling the trigger.