Noveske's Stainless Steel AR-15 Match Barrels aredesigned to offer outstanding accuracy. Composed of 416R stainless steel that's hardened to 30 RC, the bore is given improved polygonal rifling that slightly boosts projectile velocity and reduces the speed of the bore's erosion, meaning superior accuracy retention that outlasts that of barrels with conventional rifling. All Noveske match barrels have a bead-blasted satin finish, extended feed ramps, and are threaded at the muzzle for the addition of flash hiders, muzzle brakes and/or sound suppressors. Features416R Stainless 9x19mm with 1:12 right hand twistBarrel extension w/extended feed ramps1/2" x28 muzzle threads