High-Performance 8.6 Blackout AR-10 Upper Assemblies

High-Performance 8.6 Blackout AR-10 Upper Assemblies

Shop 8.6 Blackout AR-10 upper assemblies at Moriarti Armaments for compact, large-frame AR configurations. Browse complete 8.6 BLK uppers in multiple barrel lengths with available M-LOK handguards, muzzle devices, and custom finishes. Built around heavy .338-caliber projectiles and fast-twist barrels, 8.6 Blackout has become particularly popular for short-barrel and suppressor-ready platforms. Compare available uppers by barrel length, twist rate, gas system, handguard, muzzle configuration, receiver pattern, finish, and included components.

What is the difference between 8.6 Blackout and .338 ARC?

8.6 Blackout and .338 ARC both use .338-caliber projectiles, but they are different cartridges designed around different AR platforms. 8.6 Blackout is generally associated with the large-frame AR-10 platform, while .338 ARC was developed for the smaller AR-15 platform. Both can support subsonic and supersonic ammunition, but they differ in cartridge dimensions, components, magazines, bolts, and overall platform requirements. They are not interchangeable, and the firearm must be specifically chambered for the selected cartridge.