As it passes through the close tolerance hole in the end of the perforated tube, it temporarily forms a blockage to further forward movement of the expanding gas from the barrel. As the bullet exits the barrel, the expanding gases follow it into the chamber created between the cup and the shroud. The end of the latter is closed except for a small hole for the bullet to pass through. Construction Īnimation of the Vickers muzzle booster operation, showing the expanding gases pushing the barrel to the rear relative to the cooling jacketĪ Vickers-type muzzle (or recoil) booster, the "typical" type, consists of two parts: a flared "cup" on the muzzle of the barrel, and a perforated tube around the end of the muzzle, attached to the main body of the weapon. This increased the initial velocity of the barrel and bolt, providing more energy for the operation of the mechanism. The muzzle booster increased the recoil force transmitted to the barrel by directing some of the escaping gas into pushing the barrel back rather than letting it all expand outwards at the muzzle, in essence acting as an auxiliary gas-operating system, with the barrel acting the role of the operating rod. This movement provides the energy required to extract and eject the spent cartridge, and compresses the recoil spring to complete the cycle. At firing, the recoil from the cartridge pushes the barrel and bolt together backwards within the gun. 30, Model of 1904, soon licensed by the Russians on their M1905 3-line machine gun as well as the British on the Vickers machine gun of 1912, and in 1915 by Germans on their MG 08 without a license. Ramsay of Vickers, Sons & Maxim in 1904 and first adopted on the US Maxim Machine Gun, Caliber. The recoil booster was invented in 1904 by Trevor Dawson and J. However, unlike a muzzle brake, a muzzle booster uses the pressure of the expanding gases, rather than the reaction force, and it does not alter the felt recoil of the weapon, it merely adds more energy to the operating components. The muzzle booster is distinct from the muzzle brake, which is designed to use the propellant gases to reduce the recoil of the firearm. In spite of its name, a muzzle booster does not increase muzzle force or velocity but instead is usually used to improve the reliability and/or rate of fire of a recoil operated firearm. MG 42 machine gun, which featured a large muzzle booster at the end of the barrelĪ muzzle booster or recoil booster is a device fixed to the muzzle of a firearm, intended to harness the energy of the escaping propellant to augment the force of recoil on portions of the firearm.
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