KynSHOT RB5000L Hydraulic Recoil Buffer Features The KynSHOT RB5000L is a hydraulic buffer system optimized specifically for AR-15 rifles that run under-gassed or struggle to cycle reliably with low velocity ammunition such as .300 Blackout. Designed for use with a Mil-Spec style carbine buffer tube that has a 7 internal depth the RB5000L can be paired with any style buffer spring though it performs best with reduced-power springs. The buffer absorbs the recoil impulse generated by the bolt carrier s rearward motion preventing bolt bounce as a new round chambers. This hydraulic dampening action is what allows the RB5000L to reduce felt recoil by approximately 30% compared to a standard buffer. Made lighter and requiring less force to cycle than KynSHOT s standard AR-15 buffer the RB5000L is intended for rifles that will not lock back on the last round using a standard or heavy buffer system. Stainless steel construction provides corrosion resistance and long-term durability in a part that experiences constant mechanical cycling. As a drop-in replacement for any buffer system installation is straightforward for anyone comfortable performing basic AR-15 maintenance. For shooters running subsonic .300 Blackout loads or other low velocity ammunition through an under-gassed AR-15 the KynSHOT RB5000L offers a targeted solution to smoother more reliable cycling. KynSHOT RB5000L Hydraulic Recoil Buffer Specifications Manufacturer: KynSHOT Model: RB5000L Hydraulic Recoil Buffer Color: Silver Material: Stainless Steel Compatible Hosts: AR-Platform Caliber: 300 Blackout Length: 3.65 Proofs: Corrosion Resistant Weight: 4 oz Available At: GrabAGun