i ordered one of the Kimber 22lr kits from Cabelas. It was delivered in about a week. I just got it in Jan. It works very well. I put it on a kimber pistol, but i believe it will work on most 1911's. I have put over 2000 rnds through it so far. There is a set screw under the rear sight to keep it tight in the dove tail. Mine came loose or was loose and i didn't notice it for a bit. I snugged it up and added a drop of locktite. That was the only problem i have had with it. They will not shoot low velocity rnds reliably. ( I had to try) cci stingers work great, most high velocity rounds will work well. If you lube the hell out of the rails and manually rack the slide a couple hundred times it helps with break in. I did and it works great. My only complaint is that it doesn't lock the slide after the last rnd. Really not an issue count your rnds. Good product for sure.