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Gain-twist rifling, however, is more difficult to produce than uniform rifling, and therefore is more expensive. The military has used gain-twist rifling in a variety of weapons such as the 20 mm M61 Vulcan Gatling gun used in some current fighter jets and the larger 30 mm GAU-8 Avenger Gatling gun used in the A10 Thunderbolt II close air ...
In common with the other de Bange cannons, the 155 L de Bange had a hooped steel construction with gain-twist rifling. In its original (1877) conception, the cannon required a wooden platform from which to fire. Its recoil was absorbed simply by friction with the platform, and the 155 L de Bange had to be pushed back into position after every shot.
This revolver uses gain-twist rifling, starting with a slow twist rate of one turn in 100 in and gradually increasing up to one turn in 20 in to accommodate the combination of a heavy bullet and high pressure and velocity typical for the round. [3]
The 155 L had a hooped steel construction with gain-twist rifling. The guns had a de Bange breech and fired separate loading bagged charges and projectiles. [3] The guns sat on a Vavasseur mount with a gun shield which was bolted to a four-axle, well-base flatcar.
Early model M16 barrels had a rifling twist of four grooves, right-hand twist, one turn in 14 inches (1:355.6 mm or 64 calibers) bore—as it was the same rifling as used by the .222 Remington sporting cartridge. After finding out that under unfavorable conditions, military bullets could yaw in flight at long ranges, the rifling was soon altered.
The bore twist is 1-turn-in-11.25 inches [1:285.75 mm] and the rifling is five radial lands and grooves (5-R) with a right-hand (RH) twist. Because of the odd number of lands, none of the lands are 180° apart, i.e. in direct opposition. This results in less bullet deformation, which (at least in theory) produces more consistent point of impact.
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The K1 has 1-in-12 rifling twist for .223 Remington, while the K2 has 1-in-7.3 rifling twist for 5.56×45mm NATO. [6] The carbine version of K2 named K2C was developed and shown to the public in 2012 by SNT Motiv.