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Closed-bolt designs are often used in rifles. The improved accuracy of closed-bolt weapons is more desirable, while the poorer heat dissipation is less of an issue for slower-firing weapons. In contrast, open-bolt designs are more often used in automatic weapons, such as machine guns. For fast-firing automatic weapons, heat will rapidly build ...
In an open-bolt gun firing semi-automatically, the bolt is caught and held at this point by the sear after each shot; and in automatic open-bolt fire, it's caught and held in this manner whenever the trigger is released. In contrast to this, in closed-bolt guns, the trigger and sear do not affect the movement of the bolt directly.
The Vickers machine gun or Vickers gun is a water-cooled.303 British (7.7 mm) machine gun produced by Vickers Limited, originally for the British Army. The gun was operated by a three-man crew but typically required more men to move and operate it: one fired, one fed the ammunition, the others helped to carry the weapon, its ammunition, and ...
A telescoping bolt is a bolt that wraps around the breech end of the barrel. This bolt design is often used to reduce overall weapon length without sacrificing barrel length or bolt weight. A turn bolt refers to a firearm component where the whole bolt without using a bolt carrier turns to lock and unlock.
The Vickers class K/Vickers G.O. machine gun is a gas-operated weapon, firing from an open bolt (thus making it non-synchronizable for firing through a spinning propeller [citation needed]) in full automatic mode only. Its gas cylinder is located below the barrel, and a long-stroke gas piston operates a vertically tilting bolt.
Unlike the AKM and RPK the PK machine gun series is an open bolt design, which improves heat management during automatic fire compared to closed bolt designs and helps avoiding the dangerous phenomenon known as "cook-off", wherein the firing chamber becomes so hot that the propellant contained in a chambered round unintentionally ignites ...
Mounting of synchronized Vickers gun on Bristol Scout, using the Vickers-Challenger gear: note long push rod at awkward angle British gun synchronization got off to a quick but rather shaky start. The early mechanical synchronization gears turned out to be inefficient and unreliable and full standardisation on the very satisfactory hydraulic "C ...
Most Marlin M1917 and M1918 guns saw use in aircraft as defensive armament—however, as they retained the original M1895 "potato digger" ordnance's closed bolt firing cycle, these Marlin guns, weighing only some 25 pounds (11.34 kg) apiece, [26] versus the standard Vickers gun's 33 pound (15 kg) figure for aviation use, could readily be used ...