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The FN-created cartridge was named "5.56×45mm NATO" with a military designation of SS109 in NATO and M855 in the U.S. [13] These new SS109 ball cartridges required a 228 mm (1-in-9 inch) twist rate while adequately stabilizing the longer L110 tracer projectile required an even faster, 178 mm (1-in-7 inch), twist rate.
Cartridges like the American 5.56×45mm M193 (1964; originally used in the M16), Soviet 5.45×39mm M74 (1974; used in the AK-74, which replaced the AKM), Belgian SS109 / 5.56×45mm NATO (1980; used in most AR-15 systems), and the Chinese 5.8×42mm (1987; used in the QBZ-95) allow a soldier to carry more ammunition for the same weight compared ...
The table below gives a list of firearms that can fire the 5.56×45mm NATO cartridge, first developed and used in the late 1970s for the M16 rifle, which to date, is the most widely produced weapon in this caliber. [1]
Each M27 link consists of a single piece of metal curved into two partial cylinders, into which adjacent rounds slide. Like the M13 link, the M27 link is a push-through design.
The barrel used 1:12 inch rifling to fire M193 rounds, as during its development there were no plans to adopt SS109 ammunition in the South Korean army. The shortened design was adopted as the K1A SMG in 1981 and issued to special forces, commanders, radio operators and others who needed a short SMG-like weapon.
ST Kinetics has said that the BR18 has an effective range of 460 m and 800 m when fired with M193 and SS109 ammunition respectively, with a muzzle velocity of 860 m/s when employing SS109 rounds out of the "Assault" variant, equipped with a 14.5" barrel. [1] The charging handle is placed above the trigger guard. [2]
Type 89 rifle ammunition is interchangeable with the 5.56×45mm SS109/M855 round used by the U.S. military and NATO. [17] Along with the 7.62×51mm round used in the Type 64 rifle, this allows for interchangeability with ammunition stockpiles of U.S. forces stationed in Japan.
The barrel has a chrome-lined bore with 6 right-hand grooves and a 178 mm (1:7 in) rifling twist rate that is optimized for use with heavier SS109 5.56×45mm NATO rounds. A barrel with a 305 mm (1:12 in) twist rate designed specifically to stabilize the lightweight M193 cartridge is also available. [2]