The KynSHOT RB5001 Recoil Buffer is designed for Fixed Stock AR-15s. This is a proven system that has seen heavy use with civilian competition shooters, law enforcement personnel and the United States Armed Forces. This buffer has patented damping technology to absorb the shock of impact from the bolt carrier's rearward motion and to prevent bolt bounce as a new cartridge is chambered. The RB5001 reduces felt recoil 20-30%, while largely eliminating muzzle flip. The improvement in weapon accuracy - specifically second and third shot accuracy - is even more noticeable as shooters report that their time to reacquire a target decreases, and in many cases never leaves their scope sights.Features Drop-in replacement Reduce felt recoil Improve reliability