I got the serial number from the guy and it is a 7 digit number, unlike most Detonics gun numbers. He said the number was engraved on the bottom of the barrel, sounds right. I have a write up somewhere that stated that "kits" were available for the Colt OffACP. I may even have factory papers/price list of such an item. I'll have to do some digging.
L8r
Conley