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Criterion Hybrid contour match grade .308 AR barrels offer precise accuracy without the additional weight of a heavy barrel contour. These .308 AR barrels have a M118LR chamber which has a longer throat that results in better performance with loads that have heavier bullets. This feature reduces wind drift when fired at longer ranges. These barrels work with either .308 Winchester or 7.62x51 ammunition and come with an installed barrel extension. CBI .308 AR barrels are usable with DPMS, Remington, and Fulton pattern rifles. They are compatible with muzzle devices with a 5/8x24 thread, and an indent is available opposite the gas port for easy installation. Chambers are finished, but headspace should be checked prior to installation. Chrome lined variants come in 16, 18, and 20-inch lengths. These barrels are button rifled and hand-lapped to ensure consistent bore uniformity.