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The Criterion Hybrid Contour Match Grade .308 AR barrel is an excellent option for anyone who requires precision and accuracy but doesn't want the additional weight of a heavy barrel. It has a M118LR chamber which has a longer throat. The longer throat allows it to improve the performance of loads that use heavier bullets. This feature helps to reduce wind drift when firing at long ranges. The barrel has been designed to accommodate either .308 Winchester or 7.62x51 ammunition. An installed barrel extension comes with the barrel. The CBI .308 AR barrel was created to be compatible with DPMS, Remington, and Fulton pattern rifles. It accepts muzzle devices with a thread of 5/8x24. To make installation easy, an indent is provided opposite the gas port. Chambers have been finished, but it is recommended to check the headspace before installing. The barrel is available in stainless steel and comes in two lengths, 20" and 22". The barrels are button rifled and have been hand lapped to ensure consistent bore uniformity. The 20" Hybrid requires a gas block of 0.750", while the 22" Hybrid needs a gas block of 0.875". Note that gas blocks are not included.