Rosco Manufacturing K9 Greenline Tactical Barrel 5.56 NATO 11.5 inch 1-7 Twist 1/2 x 28 Thread 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 5.56mm Tactical Barrel: Manufacturer: Rosco Manufacturing Color: Black Finish: Nitride Fabric/Material: 416R Stainless Steel Caliber: 5.56x45mm NATO Barrel Length: 11.5 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 Flutes: No Gun Make: AR Platform Gun Model: M4 Weight: 2 lb Condition: New Last Chance: Yes Package Contents: Rosco Manufacturing K9 Greenline 5.56mm Tactical Barrel Gas Tube What firearm models does the manufacturer say Rosco Manufacturing K9 Greenline 5.56mm Tactical Barrel is compatible with? The manufacturer suggests that Rosco Manufacturing K9 Greenline 5.56mm Tactical Barrel is compatible with M4Rosco Manufacturing K9-115-HY-DUFFY-556-7-PT: K9 Greenline Tactical Barrel 5.56 NATO 13.95 inch 1-7 Twist 1/2 x 28 Thread Mid-length Black Nitride