Rock River Arms 16 inch chrome moly, chrome-lined, lightweight profile barrel, chambered in 5.56 NATO with 1:9 twist, midlength gas system, .750 diameter gas block journal and 1/2-28 threaded muzzle.

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.

Ballistic Advantage, Performance Series, Hanson Profile Barrel, 556NATO, 13.7", Black Finish, Lo Pro Gas Block included. 1:7 twist, carbine length gas system, .750 journal and a 1/2x28 threaded muzzle. Machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish and QPQ coated M4 feed ramp extension.

Faxon Firearms barrels are the pinnacle of value. Manufactured 100% in-house from cradle-to-grave, these barrels are fully stress relieved, air-gauge tested, and 11 degree target crowned to ensure superior accuracy.