Breechblock
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A breechblock is the part of the firearm action that closes the breech at the moment of firing. Most modern small firearms use a rotating breechblock, better known as a bolt, first used in manually operated bolt action weapons, but later made to work in automatic weapons. Some variations of non rotating breechblocks include:
- blowback - in which the breechblock is closed by a powerful spring
- Delayed blowback - as found in many weapons from Heckler & Koch
- Tipping breechblocks - both self-actuating (AG-42 Ljungman is one example) and manually operated by a lever (Peabody action) or other means (Krag-Petersson)
- Falling block (Sharps rifle)
- Rolling block (Remington)
- Trapdoor (Springfield)
See also
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