This review of the Sharps Rifle Company XPB Bolt Carrier Group (BCG) highlights its advanced materials and design features that surpass mil-spec standards. The BCG utilizes S7 tool steel for both the bolt and carrier, offering significantly higher tensile strength than standard Carpenter 158 steel. It also features a durable Diamond-Like Carbon (DLC) coating for enhanced wear resistance and easier cleaning. The balanced design aims to reduce carrier tilt and improve shooting dynamics. The reviewer, with approximately 500 rounds of testing, found the BCG to be exceptionally clean-running and durable, even in a dirty chamber, recommending it as a high-value upgrade for AR-15 builds.
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