Easy install if you have a detent pin, like I have on my nak 9. No grease or anything needed; just hold the detent pin down with your fingernail while screwing on the brake. For performance: 5 stars. I'd say the recoil reduced to the level of a 22lr(or maybe a tad more) while firing the pistol like a pistol(no stock). And best of all it only increases the noise by about 10-20%. Highly recommend, does as advertised, easy to install, high quality.