Bolt (firearms)
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A bolt is the part of a repeating, breechloading firearm that blocks the rear opening of the barrel chamber while the propellant burns, and moves back and forward to facilitate loading/unloading of ca
Bolt from a Karabiner 98k bolt-action rifle. Note the curved handle on the side for manual operation
AR-15 bolt carriers: Upper example is for use with short-stroke gas piston, the lower example is for use with direct impingement
AK-74 bolt and firing pin
K31 bolt disassembled
Semi-automatic firearm
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A semi-automatic firearm, also called a self-loading or autoloading firearm, is a repeating firearm whose action mechanism automatically loads a following round of cartridge into the chamber and prepa
The Fusil Automatique Modele 1917 was the first semi-automatic gun that fires cartridges to be widely issued in the infantry of any nation's army.
SIG Pro semi-automatic pistol
Glock 18, a fully-automatic machine pistol from the mid-1980s (The picture shown is the Glock 18C)