Using the same principal as shock absorbers on your car to smooth out the ride, the Kynshot Hydraulic Recoil Buffer for 9mm AR-15s softens the thump of felt recoil. The buffer uses a hydraulically dampened piston to absorb the shock of impact from the bolt carrier’s rearward motion, resulting in less recoil, faster follow-up shots, and improved accuracy. This Kynshot’s simple, shock-absorbing hydraulic buffer system even decreases the typical bolt bounce when a new round is chambered, mean your carbine cycles smoother with less wear and tear. Both the weight and length of the Kynshot Hydraulic Recoil Buffer for 9mm AR-15s have been optimized to stop the bolt just behind the bolt catch – eliminating the need for a spacer. Dampens bolt carrier movement for smoother cycling Reduces recoil and vibration Diminishes wear on parts Speeds sight recovery Stainless steel construction Spring noise is greatly reduced Kynshot’s Hydraulic Recoil Buffer for 9mm AR-15s is compatible with any 9mm AR-15 – from 5″ pistols up to 16″ carbines, firing either suppressed or unsuppressed, and using any type of ammo.