These CMMG 5.56mm AR15/M16 come ready with a variety of features. Barrels are available with a salt bath nitride finish for a unparalled hardness and corrosion resistance, or in 416 Stainless Steel, for exacting accuracy. Nitrided barrels are machined from 4140 chrome moly steel. All barrels have a medium taper profile, allowing for an excellent balance between strength and weight savings. Barrels feature a 1-7 twist and 1/2-28 muzzle threads. Barrels fit .750 diameter gas blocks. 16" barrels have a mid-length gas sytem. 18" barrel has a rifle length gas system. 12.5" barrel has a carbine length gas system.
SPECS: Fits AR15/M16. Available in 4140 Chrome Moly steel with a Nitride finish or in 416 Stainless Steel. Gas Block OD - .750". Muzzle threads - 1/2-28. Chamber - 5.56x45mm NATO. M4 Feed ramps.