1911 serial number 216XXX, I checked online and found that serial was assigned to Remington Rand production for 1945. The slide on this pistol however is a Colt 22 Conversion slide. The grips are brownish black plastic with a Colt pony on it. The mainspring housing is flat. This is not my pistol but a coworkers, I am assuming the gun originally had a Remington slide, an arched ms housing, and different grips. He wants it back to 45ACP configuration. Here are my questions: 1. Is the serial number data base correct and thus this pistol originally had a Remington slide? 2. Did Colt ever take these frames either from Remington or in house and put their own conversion unit on them (ie: could this pistol be in the factory configuration now)? 3. If it was Remington, how difficult/expensive is it to find a correct slide? 4. What is the value of the conversion unit if he wants to sell it to recoup expenses? 5. Any other Remington specific parts for it (barrel...bushing...etc)? 6. If he isnt into the collecting of it and thus making it original, can any Colt slide, bushing, barrel, be installed on this frame? I cant show photos right now as I am not at my home computer. Any help would be appreciated.