Cmmg Ar-15/M16 5.56mm Barrels

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Chambered in 5.56mm NATO, these medium profile barrels feature a 1-7 twist with 1/2″-28 muzzle threads, and accept .750″ diameter gas blocks. Barrels are available in either 416 stainless steel or 4140 chrome moly steel with a nitride finish.Select either a 12.5″ barrel with a carbine length gas system, 16″ barrel mid-length gas system, or an 18″ barrel with rifle length gas system. Mfg: Cmmg SPECS: 4140 chrome moly steel or 416 stainless steel. Nitride black finish or stainless steel. 1/2″-28 muzzle threads. 750″ OD Gas Block.