What does breech mechanism mean?

Definitions for breech mechanism
breech mech·a·nism

This dictionary definitions page includes all the possible meanings, example usage and translations of the word breech mechanism.


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Wikipedia

  1. breech mechanism

    A breechloader is a firearm in which the user loads the ammunition (cartridge or shell) via the rear (breech) end of its barrel, as opposed to a muzzleloader, which loads ammunition via the front (muzzle). Modern firearms are generally breech-loading, while early firearms before the mid-19th century were almost entirely muzzle-loading. Mortars and the Russian GP-25 grenade launcher are the only muzzleloaders remaining in frequent modern usage. However, referring to a weapon specifically as breech loading is mostly limited to single-shot or otherwise non-repeating firearms, such as double-barreled shotguns. Breech-loading provides the advantage of reduced reloading time, because it is far quicker to load the projectile and propellant into the chamber of a gun/cannon than to reach all the way over to the front end to load ammunition and then push them back down a long tube – especially when the projectile fits tightly and the tube has spiral ridges from rifling. In field artillery, the advantages were similar – crews no longer had to get in front of the gun and pack ammunition in the barrel with a ramrod, and the shot could now tightly fit the bore, increasing accuracy. It also made it easier to load a previously fired weapon with a fouled barrel. Gun turrets and emplacements for breechloaders can be smaller, since crews don't need to retract the gun for frontal loading. Unloading a breechloader is much easier as well, as the load can be extracted from the breech end and is often doable by hand; unloading muzzle loaders requires drilling into the projectile to drag it out through whole length of the barrel, and in some cases they are simply fired to unload. After breech-loading became common, it also became common practice to fit recoil systems onto field guns to prevent the recoil from rolling the carriage back with every shot and ruining the aim. That provided faster firing times, but is not directly related to whether the gun is breech-loading or not. Now that guns were able to fire without the entire carriage recoiling, the crew was able to remain grouped closely around the gun, ready to load and put final touches on the aim, prior to firing the next shot. That led to the development of an armored shield fitted to the carriage of the gun, to help shield the crew from long range area or sniper fire from the new, high-velocity, long-range rifles, or even machine guns.

Military Dictionary and Gazetteer

  1. breech mechanism

    The mechanism used for opening and closing the breech of a fire-arm and securing it against the escape of the gas. In small-arms this is readily accomplished. The use of the metallic cartridge-case renders any special gas-check unnecessary, as the case itself by being expanded against the walls of the chamber serves the purpose. The various mechanisms used in small-arms have been classified as follows: 1st, Fixed chamber; 2d, Movable chamber. The second class is now obsolete. The fixed chamber class is subdivided into—1st, Barrel moves; 2d, Breech-block moves. The first class comprises many of the shot-guns in use, the second, the best known of military arms. Under this latter class are the following subdivisions: 1st, Sliding block; 2d, Sliding and rotating; 3d, Rotating about an axis. We find excellent guns under each of these classes which are further subdivided as to the direction of the motions. The Sharps’ may be taken as typical of the first of these classes, the Hotchkiss magazine gun of the second, and the Springfield of the third.

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Numerology

  1. Chaldean Numerology

    The numerical value of breech mechanism in Chaldean Numerology is: 8

  2. Pythagorean Numerology

    The numerical value of breech mechanism in Pythagorean Numerology is: 9

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"breech mechanism." Definitions.net. STANDS4 LLC, 2024. Web. 29 Mar. 2024. <https://www.definitions.net/definition/breech+mechanism>.

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