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The barrel is 409 mm (16.12 in), chrome lined, and features a six groove, right hand, 1:230 mm (9 in) twist. [ 4 ] In August 2010, Ruger announced that the rifle would be offered in the 6.8mm Remington SPC cartridge.
The barrels come with either a melonite lined or chrome-lined 4140 steel rifling, and 7075 T6 aluminum receiver with a hard-coat black anodized finish. [ 13 ] The Standard model has an adjustable CAR-15 stock and comes with 10-round or 30-round magazine.
Barrel is fluted for reduced weight and improved barrel-cooling and features an SR-556/Mini-14-style flash suppressor mounted with a 5/8"-24 thread. Chrome-plated bolt and one-piece bolt carrier with oversized and radiused-rear bearing surface. Six-position telescoping M4 style buttstock is mounted on a Mil-Spec diameter tube.
Later, the chrome-plated carriers were dropped in favor of Army-issued notched and parkerized carriers, though the interior portion of the bolt carrier is still chrome-lined. The barrel rifling had a 1:12 (305 mm) twist rate to adequately stabilize the M193 ball and M196 tracer ammunition. The Air Force continued to operate these weapons until ...
Rate of rifling twist is 178 mm (7.0 in). Due to the use of a shorter barrel, the T91 has 20% more recoil than the T65K2. Average group size at 175 metres (191 yd) also increased by 10 mm (0.39 in). The chamber and bore are chrome-lined and can fire all standard 5.56×45mm NATO ammunition.
The rifle's caliber is .223 Remington/5.56×45mm NATO, and the barrel is hard chrome lined in both the bore and chamber. Unlike the current Colt M4 Carbine which features a four-position telescopic stock, the Bushmaster has a six-position stock.
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 REC7 rifle's forged 7075 aluminum upper and lower receivers are Type 3 hardcoat anodized. The lower houses an ultra-dependable single-stage trigger. The upper supports a free-floated, hammer-forged, chrome-lined barrel with M4 feed ramps machined into the receiver and the barrel extension. A mil-spec A2 flash hider protects the muzzle. [3 ...