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Bullets used in many cartridges are fired at muzzle velocities faster than the speed of sound [10] [11] —about 343 metres per second (1,130 ft/s) in dry air at 20 °C (68 °F)—and thus can travel substantial distances to their targets before any nearby observers hear the sound of the shots.
Most stock airsoft guns have 6.03–6.05 mm (0.237–0.238 in) bore barrels, but best performance [27] is usually seen with "tightbore" barrels, which are 6.01–6.05 mm (0.237–0.238 in) in diameter. However, the tighter the bore, the more likely the chance of a pellet jam, and subsequently, tightbores need to be cleaned and lubricated regularly.
It is more accurately known as the M42 × 1 mm standard, which means that it is a metric screw thread of 42 mm diameter and 1 mm thread pitch. (The M42 lens mount should not be confused with the T-mount , which shares the 42 mm throat diameter, but differs by having a 0.75 mm thread pitch.)
The KPV was a heavy machine gun developed by S. V. Vladimirov. It was developed in 1944 and adopted in 1949. It combines the rate of fire of a heavy machine gun with the armor-piercing capabilities of antitank rifles and was designed to combat lightly armored targets, firepower and manpower of the enemy located behind light cover, as well as to be an anti-aircraft machine gun.