The JPBC-5 full mass .308 Cal carrier is engineered to enhance the reliability of your firearm, particularly in suppressed configurations, short-barreled rifles (SBRs) and rifles lacking an adjustable gas system. With its increased weight compared to a standard DPMS LR-308 carrier, this carrier introduces the necessary cycling delay to ensure dependable performance in these specialized setups. The design features forward assist serrations, ensuring seamless compatibility with both DPMS and Armalite rifle platforms. For optimal operation, the JPBC-5 requires a DPMS pattern bolt, firing pin, firing pin retainer pin and cam pin. Elevate your shooting experience with a carrier that prioritizes precision and reliability in challenging conditions. Large frame Constructed from stainless steel QPQ black finish