I don't know how many of you have heard of bill springfield but he does trigger work for ptr-91's, hk, and ar's. I sent him the trigger from my stag parts kit and had it back about a week and a half later. The creep this trigger had is gone and it feels much better now. Now I've always heard that if you mess with an ar's trigger you can expect it to fail. I spent a great deal of time searching around and here's the only example I could find of a failure http://www.m4carbine.net/showthread.php?t=8260 Here's what he says he does I also asked him specifically about failure (doubles or hammer falling without a pull) and hardening, and if one kit was better than others and he said Take it however you will but I'm very happy with my 4 pound trigger and it seems like a vast improvement. I still may try one of the new double stage triggers coming out but in the meantime, Bill's work feel great.