Rosco Manufacturing K9, Barrel, 556NATO, 11.5 in, Patrol Length Gas System, Fits AR-15, Melonite Finish, Black, Includes Patrol Length Gas Tube K9-115-HY-DUFFY-556-7-PT

The K9 11.5 offers a proprietary patrol length gas system that is smoother than carbine length, more reliable than mid-length. Features 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 with improved harmonics, fit and finish. We recommend a minimum handguard length of 10 with this barrel.NOTE: COMES WITH PATROL LENGTH GAS TUBEBarrel Length11.5Barrel Weight25.47 ozBarrel Material416RBarrel Caliber5.56Barrel ProfileContinuousTwist1/7Barrel Thread1/2 x 28Barrel Gas Block Size0.750Gas System LengthPatrolBarrel Crown11 DegreeBarrel FinishNitrideBarrel Extension FinishNitride