22 ARC 21 Stainless Steel Barrel comes with Tunable Gas Block and XL Rifle Gas Tube. – The 22 ARC (Advanced Rifle Cartridge) brings exceptional power and performance elegantly packed into a compact cartridge that fits into your AR-15 but is equally at home in a bolt action. By utilizing the new 62 gr. ELD-VT bullet the 22 ARC brings extraordinary performance that rivals the 22-250 to the AR-15 platform. – The 22 ARC was engineered to use modern high-BC bullets. Designing the cartridge and chamber in unison provides consistent accuracy great velocity spreads and an outstanding shooting experience. This cartridge is the result of careful and meticulous design following the same proven methodology as the highly acclaimed 6mm ARC. – Features – 21 DMR 416R Stainless Steel Barrel – XL Rifle Gas System – .750 tunable gas block included – 1/2-28 muzzle threads – 1:7 twist barrel – 1 MOA Guarantee