I also have a MK VI that I bought in Conn. about 1986 for $700. It has a double action by Seecamp. it takes the regular MKVI 6rd.mags. Have a modified DeSantis holster for it. A very nice firearm that I carry from time to time. I thought that Seecamp did the conversions himself. I also have a Scoremaster in .45 and .451. Just a different barrel. There is an outfit in Lenoir City Tn. called Stormlake that still makes Barrels for the Detonics. They use to supply old timers like Rob Barkman with BBls.and know him. From what I understand he's with Olympic Arms at present. If you are looking for Stormlake Mach. phone # e-mail me and I will forward it.