ORIGINAL: halcon
I have installed Timney triggers on some and Just changed the springs on others . No problems with misfires . It isn't all that hard to do in my opinion .
4 of the 5 of my Timneys needed at least .015" milled off of the safety. Would you feel comfortable or have access to a Mill if you try to doit yourself and realize it came oversized? Thats one of the reasons I let my smith do it, and I work in a machine shop.