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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 ...
The Mod 0 used an increasing twist in the rifling while the Mod 1 used a uniform twist and a different groove pattern. The Mark 3 was the same as the Mark 2 but used a one-step conical liner. The Mark 3 Mod 0 had an increasing rifling twist (like the Mark 2 Mod 0) while the Mark 3 Mod 1 utilized a uniform twist.
The Heckler & Koch HK417 is a battle rifle designed and manufactured by Heckler & Koch. [1]Being the larger caliber version of the Heckler & Koch HK416, and chambered for the 7.62×51mm NATO rifle cartridge, it is intended for use where the penetrative power, stopping power, and range of the 5.56×45mm NATO HK416 would otherwise be insufficient.
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]
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.
Model 1863 Springfield rifled musket and Pattern 1861 Enfield musketoon Springfield and Enfield actions. The Pattern 1861 Enfield musketoon was a short-barrel version (610 mm or 24 inches) of the Pattern 1853 Enfield rifled musket, having a faster rifling twist rate (1:48 versus 1:78), along with more rifling grooves (five grooves versus the Pattern 1853's three grooves), which made it as ...
The SEAL Recon Rifle (nicknamed the "Sniper M4" [2] and "Recce" [3]) is an American designated marksman rifle and assault rifle used by the United States Navy SEALs.Essentially a heavily modified M16 rifle, it is intended to provide SEAL snipers and designated marksmen with a versatile, accurate, lightweight, and relatively compact weapon chambered in 5.56×45mm NATO.
Another issue that has an effect on the barrel's hold on the bullet is the rifling. When the bullet is fired, it is forced into the rifling, which cuts or "engraves" the surface of the bullet. If the rifling is a constant twist, then the rifling rides in the grooves engraved in the bullet, and everything is secure and sealed.