Noveske's Stainless Steel AR-15 Match Barrels feature their Noveske Match Chamber, designed 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 medium contour, bead-blasted satin finish, M4 extended feed ramps, and are threaded at the muzzle for the addition of flash hiders, muzzle brakes and/or sound suppressors. Each barrel is shipped with a pinned, low profile gas block and barrel extension. FeaturesIndividual serialized barrel for QC purposesHand polished Noveske Proprietary Match Chamber60 degree muzzle crownBead blasted finish