The JPBC-5 full mass .308 Cal carrier by JP Enterprises is meticulously engineered to enhance the reliability of suppressed firearms, short-barreled rifles (SBRs) and rifles lacking an adjustable gas system. This robust carrier surpasses the weight of a standard DPMS LR-308 carrier, introducing a necessary cycling delay that ensures dependable performance in these specialized setups. Its design features forward assist serrations, ensuring seamless compatibility with both DPMS and Armalite rifle platforms. Additionally, each carrier is equipped with JP's enhanced gas ring, further optimizing the reliability and efficiency of your firearm's operation. Whether you're a tactical enthusiast or a precision shooter, the JPBC-5 is crafted to meet the demands of advanced shooting scenarios. Assembly with included bolt A DPMS pattern bolt, firing pin and cam pin are required This is compatible exclusively with DPMS pattern bolts, firing pins and cam pins