The K-Spec BCG is designed to enhance the reliability of your AR-15 platform, whether you are running suppressed or unsuppressed and regardless of environmental conditions. Engineered with key features to improve performance, this bolt carrier group ensures consistent, dependable operation in any scenario. Engineered for reliable performance in the most demanding conditions Optimized for reliable performance in both suppressed and unsuppressed applications, across all uses and conditions Angled carrier rail cuts ensure flawless function in adverse conditions and extended suppressed use, also known as a sand cutter Downward gas ports for reduced gas blowback to the shooter Fully auto profile Permatex applied between the gas key and carrier mating surface for a secure and reliable seal Carrier made from 8620 steel with outside rails, bolt runs and gas bores ground to .0002 tolerances, featuring a chrome-lined phosphate finish Gas key made from 4130 steel, heat-treated, secured with T25 Torx fasteners torqued to spec and staked using a hydraulic staking machine