Enhance your AR15 build with the precision-engineered CMMG 30D120A 16.1" 300BLK Barrel. This upgrade features an optimized 1:7 twist rate for superior accuracy and performance. Crafted with a medium taper profile and a properly installed M4 barrel extension, this barrel guarantees reliable operation and perfect head spacing for your shooting needs. 1:7 Twist 4140 Chrome moly 5/8X24 thread pitch Medium taper profile Carbine length gas port .750" gas block Journal Elevate your shooting experience with unmatched precision from CMMG.