Was looking for something to speed up the slow rof on my open bolt full size auto uzi. I put in the 1.4" buffer and the uzi came alive ....better than I expected by far! I just came back from the range and took the gun apart and the buffer looks brand new even after firing several 100 rounds....the gun fires much smoother even with a suppressor now. This product more than surpassed my expectations,....now I have a sub gun capable of a rof of 1000/m. Thanks guys, Bill