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Rotating bolt is a method of locking used in firearms. Johann Nicolaus von Dreyse developed the first rotating bolt firearm, the " Dreyse needle gun ", in The Dreyse locked using the bolt handle rather than lugs on the bolt head like the Mauser M 98 or M The first rotating bolt rifle with two lugs on the bolt head was the Lebel Model rifle. The concept has been implemented on most firearms chambered for high powered cartridges since the 20th century.
Ferdinand Ritter von Mannlicherwho had earlier developed a non-rotating bolt straight-pull rifle, developed the Steyr-Mannlicher Ma straight-pull rifle with a rotating bolt, which was issued to the Austro-Hungarian Army.
Mannlicher then developed the M auto rifle which had a screw delayed bolt and later the Mannlicher M operated by a gas piston. Upon closing, the bolt goes forward into 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 action is cycled, either manually by the operator, or mechanically by delayed blowbackrecoil operation or gas operation which then rotates the bolt and unlocks it from the breech so that it can be withdrawn in order to extract and eject the spent casingand the next round can be chambered.
In gas operation, the gas port, which meters a portion of the combustion Rock It - Racer X - Live Extreme Volume II 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. Left Dominant Part 5 - Swine Bolt 45* - Rotary Canteen Object bolts are found in delayed blowbackgas-operatedrecoil-operatedbolt actionlever-action and pump-action weapon designs.
Another form of delayed blowback which the bolt head rotates as the firing pin strikes locking the chamber until the gas pressure reaches a safe level to extract. As the firing pin retracts, the bolt head turns anti-clockwise unlocking the breech. From Wikipedia, the free encyclopedia. This article does not cite any sources. Please help improve this article by adding citations to reliable sources.
Unsourced material may be challenged and removed. Categories : Firearm components Firearm actions. Hidden categories: Articles lacking sources from January All articles lacking sources Commons category link is on I Flip Styles - D.I.T.C* - Rare & Unreleased. Namespaces Article Talk.
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