The KynSHOT Hydraulic Recoil Buffer for AR-15 Fixed Stock has patented damping technology that absorbs the shock of impact from the bolt carrier and prevents bolt bounce as a new cartridge is chambered. This buffer reduces felt recoil by 20%-30% and also eliminates muzzle flip. It is made from 17-4 stainless steel which has incredible resistance to corrosion with a stainless finish.