The TACCOM FPC End Plug/buffer effectively will increase the 2nd stage of the factory recoil system, engaging sooner and for a longer period of time. The end result will be less felt recoil and less muzzle rise. The longer buffer will also result in less wear and tear on the receiver and cross pin hole. This an easy installation….remove the butt stock, slide the cross pin out to remove the factory end plug, replace with the TACCOM End Plug/Buffer, install the cross pin and then the buttstock.