Would a refinishing job on a 1911 (say hard chrome, black chrome) erase original rollmarks on the slide and the serial numbers/manufacturers marks on the frame? Would a hard chrome or black chrome stop rust from spreading? How do you restore the original color of the wood grips? How can you tell if a barsto barrel is an original? The Colt Mark IV gun I acquired has "government model" stamped on the left side but the slide is commander length. Could it be that the slide was cut? The cut portion of the slide is fixed on the threaded part of the barsto barrel, which has some sort of black sleeve on it. Is it possible to restore the firing pin block/safety system? The plunger on the slide is missing and so is the activating lever on the frame.