As reported over the past few months, I have been having trouble with "failure to cycle" issues with my Kimber .45 with a Kimber .22LR conversion kit on it. What was happening was that pretty much with every magazine I shot through the gun I would get at least one incident where the slide would not fully cycle and lock closed. Kimber's answer was to use hyper velocity ammo and replace the main spring with a lighter unit. So first I tried the Remington Yellow Jackets with not much change in the problem. After literally thousands of rounds through the gun with this frustrating problem, I wanted to get it fixed once and for all. Please remember, too, that after putting mabye 1,500 rounds of .45acp through the gun, it has performed flawlessly. So the issue is with the .22 conversion kit.
So I took the pistol to a friend of mine who was a gunsmith / 1911 race gun builder in years past and he tore it down. He clipped 2 coils off the main spring and reassembled the gun. After test firing, the problem was a bit better, but still there. So he tore the gun down again and got out the looking glass for a close inspection. He found that the bolt face was rough and pitted and that there was a rough spot in the chamber. His deduction was that this roughness was robbing just enough kinetic energy from the action having to work harder to do its job to cause the failure to cycle issues.
So he polished the bolt face and chamber, cleaned everything up and we went back out to the range. The above work seems to have solved the problem for the most part as the pistol now fires fairly reliably, though still nowhere NEAR as fool proof as the .45acp configuration. Out of each box of 100 rounds I will still get 2 or 3 failures. While greatly improved, I still believe this is unacceptable performance and will be calling Kimber to see if they would like my conversion kit back for a factory check out. With the .45 slide on, I can feed this gun any ammo what-so-ever and it just keeps banging away. I believe the facory Kimber .22 conversion kit should do the same.
As always, I'll update what happens.
Then again, I kind of like McBruce's comment to me - "So ya buy a Kimber .45 and then put a .22 kit on it to shoot cheap and complain about the performance. That's like buying a Mercedes and then putting a Yugo engine in it drive cheap and then complain about the performance. What the heck is your problem?" :lol: :lol: Ya gotta admire his logic!
Edited by Larry $, 08 May 2006 - 08:36 AM.