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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 ...
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.
5.56×45mm NATO Ball (SS109) at 30 meters with a velocity of 900 ± 20 m/s 5.56×45mm NATO Ball (M193) at 30 meters with a velocity of 937 ± 20m/s Protection against all three threats must be provided.
In the end, the Belgian 5.56×45mm SS109 round was chosen (STANAG 4172) in October 1980. [61] The SS109 round was based on the U.S. cartridge but included a new stronger, heavier, 62 grain bullet design, with better long range performance and improved penetration (specifically, to consistently penetrate the side of a steel helmet at 600 meters).
The Beretta AR70/223 in its current state could not be submitted for the trials. In October 1980, NATO had chosen the Belgian 62 gr SS109 cartridge as the new standard for the 5.56×45mm round. Because the AR70/223 still ran on the older 5.56mm M193 cartridge, the platform required changes to accommodate the newly standardized SS109 cartridge.
Early ammunition had a 4-digit year with the first 2 digits (thousands and hundreds) at 9 o'clock and the second 2 digits (tens and ones) at 3 o'clock. Ammunition with an E at the 12 o'clock position (which stands for Ersättning, or "Substitute") have a bimetallic cartridge-case (brass-clad steel) due to wartime economy measures during World ...
Lake City Army Ammunition Plant (LCAAP) is a 3,935-acre (15.92 km 2) U.S. government-owned, contractor-operated facility in northeastern Independence, Missouri. It produces ammunition for military and personal rifles. Lake City was established by Remington Arms in 1941 to manufacture and test small caliber ammunition for the U.S. Army.