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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 CAR 816, also called Caracal Sultan or simply Sultan, is a 5.56×45mm NATO, gas-operated, magazine-fed assault rifle that is produced by Caracal International in Abu Dhabi, United Arab Emirates.
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 Close Quarter Battle Receiver (CQBR) [5] is a replacement upper receiver for the M4A1 carbine developed by the US Navy.. The CQBR features a 10.3 in (262 mm) length barrel (similar to the Colt Commando short-barreled M16 variants of the past) which makes the weapon significantly more compact, thus making it easier to use in, and around, vehicles and in tight, confined spaces.
Barrel length Barrel profile Barrel twist Bayonet Lug Muzzle device 603: XM16E1: A1 Triangular S-1-F A1 Yes No .223 REM 20 in. A1 1:12 Yes Type 2 Duckbill or A1 Birdcage 604: M16 rifle: A1 Triangular S-1-F A1 No No .223 REM 20 in. A1 1:12 Yes A1 Birdcage 605: Model 605: A1 Triangular S-1-F A1 No No .223 REM 15 in. A1 1:12 No Type 2 Duckbill ...
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]
The .22 TCM or 22TCM (.22, Tuason, Craig, Micromagnum) is a proprietary bottle-necked rimless cartridge created from a 5.56mm NATO / 223 Rem parent case. It was developed by custom gunsmith Fred Craig and Martin Tuason, President of Rock Island Armory (RIA) Armscor, and is used in the RIA M1911 pistols and the M22 TCM bolt-action rifle.
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.