Your current buffer should have already polymer 'dildo end' on it , which is where the Buffer Tech is installed, to swap it out just drive the pin thru and remove the old one be sure not to lose it contents ie. shot or weights whichever and you may have to drill a new hole in the Buffer Tech piece the put it and drive the pin thru. The installed standard recoil buffer on the buffer itself is no worse than the Buffer Tech piece or so I was told as I started to purchase one at a gun store one day.