Product Code Database
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| M16 bolt locking | |
| M16 bolt unlocking |
Upon closing, the bolt goes forward into Gun barrel extension or locking recesses in the receiver, and then rotates; at this point it is locked in place. The bolt remains locked until the Firearm action is cycled, either manually by the operator, or mechanically by delayed blowback, recoil-operated, or gas-operated which then rotates the bolt and unlocks it from the breech so that it can be withdrawn in order to extract and eject the spent casing, and the next round can be chambered. In gas operation, the gas port, which meters a portion of the combustion gases into the action in order to cycle the weapon, is typically located either midway down the barrel or near the muzzle of the weapon. In this way it functions as a delay, ensuring that the bolt remains locked until chamber pressure has subsided to a safe level.
Rotating bolts are found in gas-operated, recoil-operated, bolt action, lever-action, and pump-action weapon designs.
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