Lonewolf
I had an older Kimber conversion kit for my 1911 - VERY accurate, but never 100% reliable with any ammo I tried. Last year, on a whim, I sent it back to Kimber with a note describing my issues. Bear in mind this was an older kit, and I was not the original buyer. About 2 weeks later, a brand new one showed up at my door, without even so much as a note of explanation attached, just a new catalog. With the exception of some cheap Remington Thunderbolt ammo, this new conversion kit has been 100% reliable with anything I have tried yet, and just as accurate as the old one.
Just a thought, if you like 1911's and for not much more money, you can buy one of the GSG .22 1911's. I have one, and they are very nice - same gun SIG sells under their name. Not quite as accurate as the Kimber kit, but nice...
Larry