6.8 mm SPC II kits and parts
The 6.8 mm Remington SPC (or 6.8x43mm) is a rifle cartridge that was developed with collaboration from individual members of US SOCOM. Based upon the .30 Remington cartridge, it is midway between the 5.56x45mm NATO and 7.62x51mm NATO in bore diameter and velocity. It uses a .277 diameter bullet (6.8mm), which is the same diameter bullet as the venerable hunting cartridge 270 Winchester uses. It is particularly adaptable to current 5.56 mm NATO firearms, the cartridge overall length being comparable.
Though ballistically similar to the 1950s-era .280 British, improved propellant powders allow the 6.8 mm to have a smaller case. The 6.8 mm SPC (Special Purpose Cartridge) has a muzzle velocity of 2,625 feet per second (800 m/s) from a 24 inch (606.9 mm) barrel using a 115-grain Hornady OTM bullet.Current chamberings
There are currently 4 different chambers for the 6.8 SPC which yield different results. They are: 1. The original SAAMI Specifications
2. SPC II 3. 6.8x43mm (DMR has been replaced by 6.8x43, both created by AR Performance.) 4. Noveske Mod 1. Only the rifles chambered with the newer specified chamber(aka 6.8mm Spec II, Noveske Mod 1 and 6.8x43mm chambers) can safely use the higher pressure tactical & near max-maximum handloaded ammunition. Those rifles using the Original SAAMI specs should only be used with the standard cartridge pressure. ( We carry only the SPC II barrels for kits and barrel assembly's )