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The 6.8mm Remington Special Purpose Cartridge (6.8 SPC, 6.8 SPC II or 6.8×43mm) is a rimless bottlenecked intermediate rifle cartridge that was developed by Remington Arms in collaboration with members of the U.S. Army Marksmanship Unit and United States Special Operations Command [6] to possibly replace the 5.56 NATO cartridge in short barreled rifles (SBR) and carbines.
The PSD is an AR-15 style pistol which uses the same platform as the AR-15. The platform allows uppers to be switched and the lower receiver is the same specifications as the AR-15. [3] It is fitted with LWRCI's flip-up iron sights and the controls are ambidextrous. The gun has MIAD pistol grip and the trigger pull measures 7.5 pounds.
Magpul created a larger variation of their PMAG magazine, called the "Black Widow," with a blood-red follower for the 6.8mm round. The upper and lower receivers were developed specifically to fit this Magpul magazine and optimized around the 6.8×43mm round. The flagship model of the Six8 series is the UCIW which features an 8.5-inch barrel.
The .277 Wolverine (6.8x39mm) is a wildcat cartridge. It is a multi-purpose mid-power cartridge with increased ballistic performance over the AR-15 's traditional .223 Remington (5.56×45mm NATO) cartridge. The use of a modified 5.56 case means that at minimum, only a new barrel is needed to convert any 5.56-based firearm to .277 Wolverine.
It utilises an aluminium alloy upper receiver, with polymer pistol grip, trigger, and magazine housing (lower receiver) unit which is attached to the upper receiver using cross-pins. [35] It is available for the civilian market in 5.56×45mm NATO, 6.8mm Remington SPC and .450 Bushmaster via conversion kits. [9]
Barrett REC7. The Barrett REC7 (designation stands for "reliability-enhanced carbine") [1] is an American firearm manufactured as a selective-fire fully-automatic and semi-automatic rifle by Barrett Firearms. It is an M4 carbine utilizing a short-stroke gas piston system. REC7 is available in either 5.56×45mm NATO or 6.8mm Remington SPC.
The rebated rim dimensions exactly match the 6.8mm Remington SPC case, allowing the use of the 6.8mm SPC bolt-face of an AR-15, but the case has a base diameter of .4400" and cannot be reformed from any other existing case. The 400 LGND uses .4005" jacketed rifle bullets. 450 Bushmaster, Uses .284 Winchester cases. Cut the length to 1.700" to ...
History and variants. The XCR was designed in 2004 by Alex J. Robinson of Robinson Armament Co. Production of the XCR-L variant of the rifle began in mid-2006. The XCR-L is currently available in 5.56×45mm NATO, 6.8mm Remington SPC and 7.62×39mm calibers. [9] Each of these calibers is available in kit form for converting an existing rifle to ...