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Colt Canada introduced the MRR, or Modular Rail Rifle, in 2015 and released it for sale to the market in 2016. It is essentially a monolithic upper receiver with Magpul's M-LOK attachment system for accessories. The rifles are offered with 11.6, 14.5, 15.7 and 18.6 in (290, 370, 400 and 470 mm) barrels.
Bushmaster Firearms originally produced their 'First Generation' rifle using an aluminum lower receiver and a stamped steel upper receiver. This first-generation model used a long-stroke gas piston operating system. The recoil spring was within the upper barrel gas system compared to the AR-15/M-16, where the recoil spring is within the butt stock.
The Heckler & Koch HK417 is a battle rifle designed and manufactured by Heckler & Koch. [1]Being the larger caliber version of the Heckler & Koch HK416, and chambered for the 7.62×51mm NATO rifle cartridge, it is intended for use where the penetrative power, stopping power, and range of the 5.56×45mm NATO HK416 would otherwise be insufficient.
First fielded in 2018, the main improvements are the lighter Geissele Mark 16 free-float rail that incorporates M-LOK as the mounting method and a Daniel Defense cold hammer-forged barrel that returns to the lighter "government" profile contour as well as a mid-length gas system. Although initially an Army program, the URG-I has seen use by ...
20D, 20DS, 30DS, 40DS, 50DS, 60DS, 60DS Charging Rhino (competition version for 9x19mm), 120DS (UK legal Long Barrel Revolver version) All variants in Black or Hard Chrome finish. Charging Rhino version only in Black.
The rest of the barrel was maintained at the original thickness to enable the M203 grenade launcher to be attached. The barrel rifling was revised to a faster 1:7 (178 mm) twist rate to adequately stabilize the new 5.56×45mm NATO SS109/M855 ball and L110/M856 tracer ammunition.
The Tavor barrels are made from CrMoV steel and cold-hammer-forged (CHF) on the premises of the IWI factory in Ramat HaSharon. The TAR-21 barrel is 18 inches (457 mm) in length and is chrome-lined for durability and corrosion resistance. The barrel features 6 grooves in a 1 in 7 inch (178 mm) twist, or 32 calibres right hand twist rate.
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.
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