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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.
Initial design focused on optimal performance with supersonic bullets in the 85-115 gr (5.5-7.5 g) class, therefore a 1:11 twist rate barrel with 5R rifling was selected. Subsequent consumer interest in firing "heavy-for-caliber" subsonic bullets led to the design, testing, and production of 1:7 twist barrels to stabilize the longer heavier ...
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 ...
The original 28-round magazine was designed to be the same dimensions and use the same web gear as the 30-round AR-15/M16 magazines. The larger 30-round Barrett steel magazines were an inch longer and weighed 5 ounces more (0.569 lbs. [258 grams] empty / 1.82 lbs. [0.825 kg.] full) than the standard AR-15/M16 aluminum magazine.
The .277 Fury or 6.8×51mm Common Cartridge [4] [5] (designated as the .277 SIG Fury by SAAMI) [1] is a centerfire rimless bottlenecked rifle cartridge announced by SIG Sauer in late 2019. [2] Its hybrid three-piece cartridge case has a steel case head and brass body connected by an aluminum locking washer to support the high chamber pressure ...
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.
It is an M4 carbine utilizing a short-stroke gas piston system and is available in either 5.56×45mm NATO or 6.8mm Remington SPC. The REC7 is Barrett's second AR-pattern rifle chambered for the 6.8mm Remington SPC cartridge, the first being the Barrett M468 rifle. The 6.8 SPC-chambered M468 rifle employed the same Stoner expanding gas system as ...
The SIG MCX Raptor is a short-barreled rifle variant intended to serve as a carbine, featuring an 8-inch (200 mm) barrel and a Picatinny rail tail interface for attaching either a compact buttstock or a folding PCB (pistol contour brace). It is available in .277 SIG FURY, 6.5 Creedmoor and 7.62×51mm NATO. [12]