This carrier follows the DPMS Gen 1 Pattern for the AR-10 design. Unlike the MIL-SPEC sizing found in other AR platforms, the AR-10 requires specific dimensions to ensure compatibility. The 308 adjustable carrier is meticulously designed to meet the requirements of a seamless fit and optimal performance. One of the standout features of their Bootleg Four Position Adjustable Carrier is its 4 Setting Adjustable Vent System. This innovative design effectively relieves excess gas pressure generated from suppressor use, resulting in longer dwell time and reduced blowback. Another advantage of their carrier is the ability to tune the gas adjustment while installed in the rifle. Thus, the gas system can be customized to accommodate preference, optimal performance and control. The Adjustment Pin can be effortlessly removed for cleaning so that the carrier stays in top shape with minimal effort.