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The overall length is 104 cm, the gun only is 68.6 cm. The width (including ammunition case) is 44.4 cm. Sighting was usually by optical telescope. The Six-Pak consisted of the XM214, the power module, and the ammunition module consisted of two 500-round, factory packed, and disposable cassettes mounted to a holding rack.
The rifle itself is offered in two variants: the S-5.56 A1 with a 19.9-inch barrel and 1:12 pitch rifling (1 turn in 305 mm), optimized for the use of the M193 Ball cartridge; and the S-5.56 A3 with a 20-inch barrel and a 1:7 pitch rifling (1 turn in 177, 8 mm), optimized for the use of the SS109 cartridge.
The V-notch and apertures are calibrated for 5.56×45mm NATO ball ammunition. The receiver housing has recesses that work with STANAG claw mounts/HK clamp adapters (standard with the HK33, G3, G3SG/1 and MP5 ) used to mount day (typically the Hensoldt 4×24 telescopic sight) or night aiming optics.
In 1968, the Army Small Arms Program developed plans for a new 5.56 mm caliber LMG, though no funds were allocated (5.56 mm ammunition was viewed as underpowered by many in the armed forces.) Studies of improved 5.56 mm ammunition with better performance characteristics began. [ 17 ]
Cartridge, Caliber 5.56 mm Ball, Enhanced 5.56 mm Carbine, MK318 MOD 0: 5.56×45mm 62-grain Open-Tipped Match Boat-Tail cartridge. Optimized for use with 14-inch barreled weapons like the M4A1 Carbine and MK16 SCAR and designed to penetrate light barriers like windshields or car doors with no loss of accuracy or damage.
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 ]
The AAI ACR's rounds consist of a saboted flechette packaged in the conventional brass case of a 5.56×45mm round. The fin-stabilized flechette itself weighs 0.66 g, or approx. 0,023 ounce and is approximately 1.6 mm in diameter and 41.27 mm long, or 0,06 inches by 1,62 inches, with a roughened surface to ensure the sabot and flechette stay ...
The IWI Negev (also known as the Negev NG-5) is a 5.56×45mm NATO light machine gun developed by Israel Weapon Industries (IWI), formerly Israel Military Industries Ltd. (IMI). In 2012, IWI introduced the Negev NG-7, a variant chambered in 7.62×51mm NATO .