Rosco Manufacturing K9 Greenline Tactical Rifle Barrel 5.56 inch 1-7 Twist Mid-length Black Nitride. 95 features a mid-length gas system with an optimized gas port to run reliably suppressed and/or unsuppressed. The K9 continuous taper is the most effective profile to dissipate heat from hard use. With weight shifted to the back of the barrel modern attachments on the front of the rifle create a perfectly balanced and better handling rifle. Updated target crown carried over from the Purebred series. Features no 90 degree cuts improved harmonics fit and finish. Specifications for Rosco Manufacturing K9 Greenline 5.56 Tactical Rifle Barrel: Manufacturer: Rosco Manufacturing Color: Black Finish: Nitride Barrel Length: 13.95 in Barrel Profile: Continuous Taper Gas System Length: Mid Length Gas Block Journal Size-Diameter: .750 in Threads per Inch: 1/2x28 Barrel Twist Rate: 1-7 Barrel Material: 416R Stainless Steel Gun Make: AR Platform Weight: 29.8 oz Gun Type: Rifle Country of Origin: USA Package Contents: Rosco Manufacturing K9 Greenline 5.56 Tactical Rifle Barrel Rosco Manufacturing K9-1395-HY-THEDON-556-7-M: K9 Greenline Tactical Rifle Barrel 5.56 13.95 inch 1-7 Twist Mid-length Black Nitride