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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.
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.
The weapon is available in semi-automatic and select-fire configurations with four barrel lengths and differing manufacturer stated effective ranges: [10] 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)
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]
Barrel length Barrel profile Barrel twist Bayonet Lug Muzzle device M16 PIP: A2 Ribbed S-1-F, S-1-3 A2 Yes Yes 5.56 NATO 20 in. A2 1:7 Yes A1 or A2 Colt Advanced Combat Rifle: Retractable ACR ACR Type S-1-3 or S-1-F Flattop Yes Yes 5.56 NATO 20 in. A2 1:7 No ACR compensator M231 FPW: FPW Wire Short Round S-F None No No .223 REM 15.6 in. HBAR 1: ...
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.
The Heckler & Koch HK437 chambered in .300 Blackout and features a 7- and 9- inch barrel was originally announced along with the HK433 in 2017. In late 2022, the Ministry of the Interior, Municipal Affairs, Housing and Sports of the State of Schleswig-Holstein commissioned Heckler & Koch Germany to manufacture and supply the HK437.
Short barrel: weight: 22.5 lb (10.2 kg); length: 37.7 in (95.8 cm) Long barrel: weight: 23.1 lb (10.5 kg); length: 42.4 in (108 cm) Assault barrel: weight: 21.3 lb (9.66 kg); length: 37.0 in (94.0 cm) Width: 4.8 in (12.2 cm) M60E4 (mounted): Length: 43.5 in (110 cm) Width: 5.9 in (15.0 cm) Weight: 22.7 lb (10.3 kg) M60E4 (co-axial):