Rock River Arms 16 inch air-gauged, cryo-treated, stainless steel, H-Bar barrel chambered in .223 Wylde, with a 1:8 twist, midlength gas system, .750 diameter gas block journal, and a non-threaded target crown muzzle.

The .223 Wylde chamber was designed as a match chambering for semi-automatic rifles. It will accomodate both .223 Rem and 5.56mm NATO ammunition. It is relieved in the case body to aid in extraction and features a shorter throat for improved accuracy.