What is the 6.8 SPC Upper Receiver?

Officially called the 6.8 mm Remington Special Purpose Cartridge, the 6.8 SPC II was developed by US Special Forces as an upgrade to the 5.56 NATO on the M4 / AR15 platform with improved terminal performance. As a result, 6.8 SPC uppers make the AR15 an extremely capable package for personal defense and medium game hunting.

What is the effective range of a 6.8 SPC II Upper Receiver?

The effective range of a 6.8 SPC II upper receiver is between 500 and 600 yards, outperforming its 5.56 NATO, 7.62x39 and 5.45x39 Soviet ammunition rivals. It also boasts increased lethality in close-quarter battles, according to tests performed by the US Army Marksmanship Unit.

What is the muzzle velocity of the 6.8 SPC II Upper Receiver?

The muzzle velocity of the 6.8 SPC II upper receiver on an AR-15 platform is 2,650 feet per second. This higher muzzle velocity, combined with heavier projectiles, results in 44% more kinetic energy than 5.56 NATO, and therefore, greater leathality.

What is the best barrel length for a 6.8 SPC II Upper Receiver?

In general, the best barrel length (the one that the 6.8 SPC II was designed for) is 16 inches, although muzzle velocity increases with barrel length up to 20 inches. 6.8 SPC is optimized for close quarters combat and outperforms 556 NATO in short barrel setups.

What BCG do I use with a 6.8 SPC II Upper?

6.8 SPC II Uppers require a 6.8 SPC Bolt Carrier Group (BCG).

What Magazine do I use with a 6.8 SPC II Upper?

6.8 SPC II Uppers require a 6.8 SPC Magazine.