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), 1:8" twist for super- or sub-sonic use. It comes ready for silencer use, threaded 5/8-24. Includes thread protector, gas tube, steel low-profile press-fit set screw gas block (barrel has set-screw divots for gas block alignment).
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