One Premium Hybrid Contour, Nitride finished, .223 Wylde chambered, 1⁄8 Twist Criterion Barrels Inc barrel available in 10.5″, 12.5″,14.5″ and 16″ and a Battlecomp 1.5 Compensator! 10.5″ and 12.5″ barrels feature a Carbine Length Gas system, 14.5″ and 16″ barrels feature a Midlength Gas system. Choose barrel length from the drop down menu above.