The KynSHOT RB5015HD is a hydraulic recoil buffer engineered specifically for pistol-caliber carbines (PCCs) that use a Mil-Spec carbine buffer tube with a 7” internal depth. It’s designed as a straightforward drop-in replacement and is compatible with virtually any buffer spring currently available.

This buffer performs best in PCC builds with barrel lengths of 8 inches or longer, as well as in all suppressed PCC setups. It functions reliably across all 9mm ammunition types. Its weight and dimensions are carefully tuned for PCC platforms to ensure smooth cycling, reduced recoil, and proper bolt travel—stopping just behind the bolt catch. The patented hydraulic system absorbs the rearward energy of the bolt carrier, helping to eliminate bolt bounce during chambering.