bolt action


bolt action
Type of breech mechanism that was key to developing an effective repeating rifle.

It combines the firing pin, a spring, and an extractor, all housed in or attached to the bolt. A projecting handle with a round knob moves the bolt back and forth. As the bolt is thrust forward, it pushes a cartridge into the chamber and cocks the piece. The trigger releases the spring-driven firing pin inside the bolt. After firing, the extractor on the head of the bolt removes the spent cartridge and ejects it. The bolt then moves a new cartridge from the magazine.

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▪ breech mechanism
      type of breech mechanism that was the key to the development of the truly effective repeating rifle. The mechanism combines the firing pin, a spring, and an extractor, all housed in a locking breechblock. The spring-loaded firing pin slides back and forth inside the bolt, which itself is the breechblock. The bolt is moved back and forth, and partially rotated, in the receiver by a projecting handle with a round knob. One or more lugs at the front or rear of the bolt (or at both) fit into slots in the receiver and lock the bolt firmly in place against the base of the cartridge chamber when the rifle is to be fired. As the bolt is thrust forward, it pushes a cartridge into the chamber and cocks the piece. The trigger releases the spring-driven firing pin inside the bolt. After firing, the extractor on the head of the bolt removes the spent cartridge and ejects it. The bolt moves a new cartridge from the magazine and repeats the process.

      Some bolt actions lock without rotating. Straight-pull bolts are used in the Canadian Ross, the Austrian Mannlicher, and the Swiss Schmidt-Rubin rifles. Bolts that turn to lock have been standard in the Krag-Jorgensen, Lee-Enfield, Springfield, and Lebel rifles, among others.

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Universalium. 2010.

Look at other dictionaries:

  • Bolt action — The term bolt action refers to a type of firearm action in which the weapon s bolt is operated manually by the opening and closing of the breech with a small handle, most commonly placed on the right hand side of the weapon. As the handle is… …   Wikipedia

  • bolt action — noun Etymology: bolt (I) : a rifle action in which the breechblock takes the form of a manually operated sliding rod * * * bolt action, an action on the breech of a gun that consists of a manually operated sliding bolt with a projecting handle.… …   Useful english dictionary

  • bolt-action — /bohlt ak sheuhn/, adj. (of a rifle) equipped with a manually operated sliding bolt. [1870 75] * * * ˈbolt action 7 [bolt action] adjective (of a gun) having a back part that is opened by turning a ↑bolt and sliding it back …   Useful english dictionary

  • bolt-action — adj. Bolt action is used with these nouns: ↑rifle …   Collocations dictionary

  • bolt-action — bolt′ ac tion adj. mil (of a rifle) equipped with a manually operated sliding bolt • Etymology: 1870–75 …   From formal English to slang

  • bolt action — noun A type of firearm action in which the weapons bolt is operated manually by the opening and closing of the breech with a small handle, most commonly placed on the right hand side of the weapon …   Wiktionary

  • bolt-action — adjective Date: 1896 of a firearm loaded by means of a manually operated bolt …   New Collegiate Dictionary

  • bolt-action — /bohlt ak sheuhn/, adj. (of a rifle) equipped with a manually operated sliding bolt. [1870 75] * * * …   Universalium

  • bolt action —    A firearm in which the breech closure is in line with the bore at all times. It is manually reciprocated to load, unload, and cock and is locked in placed by breech bolt lugs and engaging abutments usually in the receiver …   Forensic science glossary

  • bolt-action — adjective (of a gun) having a breech which is opened by turning a bolt and sliding it back …   English new terms dictionary


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