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CAR816 personal defence weapon with a 191 mm (7.5 in) barrel; effective range 200 m (219 yd) CAR816 compact with a 267 mm (10.5 in) barrel; effective range 300 m (328 yd) CAR816 carbine with a 368 mm (14.5 in) barrel; effective range 480 m (525 yd) CAR816 carbine/assault rifle with a 406 mm (16.0 in) barrel; effective range 550 m (601 yd).
Standard length barrel is 16.1 in, with a 1:7″ twist (six lands, right twist) barrel with a ferritic nitrocarburized surface conversion which covers the barrel, inside and out, as well as the piston components. Barrel lengths of 10.5″, 12.7″, 14.7″ and 18″ (available for select models) are available. [3]
1.5x optical sight The Colt MARS (mini-assault rifle system) was an experimental, scaled-down variant of the M16 rifle tested by Colt as a personal defense weapon (PDW) around 1997. [ 2 ] It was chambered for the experimental 5.56×30mm MARS cartridge which is a shortened 5.56×45mm NATO round.
The AOR is available in two variants; the M21-5 which uses the 5.56×45mm NATO round, and the M21-7 which uses the 7.62×51mm NATO. [4] [5] There are four sub-variants for the M21-5: M21-5 CQB Carbine with 10.5 inch long barrel; M21-5 Carbine with 14.5 inch barrel; M21-5 Standard with 16-inch barrel; M21-5 DMR Sniper rifle with 18-inch barrel
The rifle is available with four barrel lengths and can be easily converted from a standard rifle (with a 16.5 inch barrel) into a carbine (with a 14.5 inch barrel), into a compact rifle (with a 10.5 inch barrel), or into a designated marksman rifle (with an 18-inch barrel) without any tools. Barrel lengths of the two calibres are exactly the same.
Barrel length Barrel profile Barrel twist Bayonet Lug Muzzle device 715 C7: A2 Ribbed S-1-F A1 Yes Yes 5.56 NATO 20 in. A2 1:7 Yes A2 N/A C7A1: A2 Ribbed S-1-F Weaver: Yes Yes 5.56 NATO 20 in. A2 1:7 Yes A2 N/A C7A2: Canadian 3rd Generation Ribbed S-1-F Weaver Yes Yes 5.56 NATO 20 in. A2 1:7 Yes A2 750 Colt/Diemaco LMG/LSW: A2 Square LMG S-F A2 ...
The rifle itself is offered in two variants. The S-5.56 A1 with a 19.9 in (510 mm) barrel and 1:12 pitch rifling (1 turn in 305 mm), optimised for the use of the M193 Ball cartridge. [17] The S-5.56 A3 with a 20 in (510 mm) barrel and a 1:7 pitch rifling (1 turn in 177, 8 mm), optimized for the use of the SS109 cartridge. [17]
Arguably, the criticisms about range, accuracy, and lethality are related to the change in barrel length and twist between the M16 and M4. The earlier 5.56 rounds (the original M193) were optimized for a 20-inch (51 cm) barrel with a 1:12 twist. In 1980 STANAG 4172 defined the 5.56×45mm NATO chambering and its accompanying 1:7 twist rifling. [38]