Smithnut and colt_saa, the gun did come with a fluted stainless cylinder. Apex did all the work. I think mokuloa is right about the product code and the serial number JMS- is correct.

I'll look around later and see if I can find some pics before Apex worked on it. I know of three that changed hands in the last few years. I'd venture that most are in competitors' hands vs collectors' hands though.