Wilson Combat's stainless steel, match grade barrel offers superior accuracy, reliability and longevity for your next custom AR rifle project. It is precisely crafted of the finest American-made 416R rifle rated steel on computer controlled equipment to exacting list of technical specifications. The barrel features a hand-polished bore and feedramps, crisp CNC markings, precision muzzle crown and a chamber and gas port optimized for reliability. Type Rifle Model Match Grade Barrel Twist 1:8" Finish Bead Blasted Length 18" Series Barrel Sights None Barrel Type Rifle Length Barrel Features Fluted Caliber Or Gauge 5.56 NATO