Well, as of right now I would be afraid to buy a used gun simply because I don't yet have an experience checking it for the problems. I already glanced though "THE REVOLVER CHECKOUT - 10 year anniversary update" document on the top of the page. But reading is one thing and knowing what you are doing is another. Then again, if it's a reputable dealer I would assume they check and test used guns before putting them for sale... some older Colts look gorgeous BTW and some people say these were the best revolvers ever made ))