Can anyone tell me about the 400 Corbon conversion kit for the 1911. How good is it and what are the drawbacks if any?
Any conversion kit will have to be fitted. I know that many of the students are tired of hearing me say this but there is NO such thing as a drop in part. There are parts that drop in, and sometimes they work but they NEVER work 100% correctly. Once you have the parts and they are fitted correctly there should be no problems. That is a pretty hot cartridge if my memory serves so the barrel will have to have lots of lock up and no slop or loose breech.
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I had assumed that it would need fitting. My main concern was if there where known problems with the system. My 45 as it sits has .044 lockup using the penny test Bob shows on the DVD. I did it several times on 2 different days and got the same results within about .004. I assume if I can get similar results with the Corbon barrel that will be enough.
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Yeah that should be enough. Make sure the loose breech is removed and you should have no problems.
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Should I put a heavier spring in. to help with the recoil
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I am not sure it is necessary. You may want to put in a slightly heavier spring and see if that helps or hinders. You can always go back to the standard spring. I will try to get Bob to weigh in on this spring question as well.
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Use a Shok-Buf and check with Corbon on the recommended spring weight.