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Closed bolt

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GB-22 Closed Bolt Version!

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Closed-Bolt Slow-Fire Uzi

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M231 stock, closed-bolt

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Civilian-Legal MGA MK46™ Closed-Bolt, w/Registered Sear

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Sar12 Production Closed Bolt Semi Auto

A semi or full-automatic firearm which is said to fire from a closed bolt is one where, when ready to fire, a round is in the chamber and the bolt and working parts are forward. When the trigger is pulled the firing pin or striker fires the round, the action is cycled by the energy of the shot sending the bolt to the rear which extracts and ejects the empty cartridge case, the bolt then goes forward feeding a fresh round from the magazine into the chamber, ready for the next shot.
    • Comparison with open bolt design 

    • Closed-bolt firearms 

    • Mixed mode firearms