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Water-cooled weapons can achieve very high effective rates of fire (approaching their cyclic rate) but are very heavy and vulnerable to damage. A well-known example is the M1917 Browning machine gun, a heavy machine gun designed by John Browning and used by US forces during WWI.
The MG 34S had a shortened and lightened barrel, a stiffer multi strands recoil spring and a better recoil booster to increase the rate of fire. The prototype weapons were developed into the very similar further improved MG 34/41, that could cope with a cyclic firing rate of 1,200 rounds per minute, but its components became highly stressed ...
The modifications to the basic MG 42 design include an extra heavy bolt (950 g (33.51 oz) vs. the 675 g (23.81 oz) MG 3 bolt) which reduces the cyclic rate of fire to around 850 rounds per minute. The rate of fire can be varied up to cyclic rate of fire of around 1,150 rounds per minute, if necessary, by changing the bolt and return spring.
The rate of fire of the M240, M240E1, and M240C can be controlled by three different gas regulator settings; The first setting allows the weapon to have a cyclic rate of fire of around 650–750 rounds per minute, The second setting allows the weapon to have a cyclic rate of fire of around 750–850 rounds per minute,
The M134 Minigun is an American 7.62×51mm NATO six-barrel rotary machine gun with a high rate of fire (2,000 to 6,000 rounds per minute). [2] It features a Gatling-style rotating barrel assembly with an external power source, normally an electric motor.
Although ShKAS is best known for its high rate of fire, it did have provision for slower cyclic rates by lowering the gas-pressure. This was done by "changing the position of the holes in the gas regulator, which comes with holes of three different sizes: 2.1 mm (1/12-inch), 2.5 mm (1/10-inch) and 3.2 mm (1/8-inch).
It fires 40 mm grenades at a cyclic rate of 325 to 375 rounds per minute, giving a practical rate of fire of 60 rounds per minute (rapid) and 40 rounds per minute (sustained). The weapon operates on the blowback principle, which uses the chamber pressure from each fired round to load and re-cock the weapon.
[6] [7] [8] The MG 42 was more efficient and cheaper to manufacture, and more robust, as well as having an extremely high cyclic rate of fire of 1,200 to 1,500 rounds per minute. [6] [7] [8] One of the Einheits Maschinengewehr GPMG roles was to provide low level anti-aircraft coverage. A high cyclic rate of fire is advantageous for use against ...