This barrel assembly is all you need to convert your 5.56mm AR to 300 AAC BLACKOUT (7.62x35mm).

The 4150 steel barrel features a black nitride finish (including bore and chamber), 1:7 in. twist for super or sub-sonic use. It comes ready for silencer use, threaded 5/8-24. Includes gas tube, steel low-profile gas block.

Requires barrel nut, gunsmith installation is recommended.

The BLACKOUT flash suppressor is one of the most efficient designs available. The proprietary features eliminate muzzle flash, even on CQB-length barrels. The BLACKOUT is inherently stronger and more impact resistant than four prong designs, while not being subject to the rapid erosion of closed-ended units. A high strength corrosion-resistant aerospace alloy, and ultra-hard Nitride finish provide the highest level of durability. Military tested and selected.