I got this gun in a trade and I'm trying to find out who built it. It is a ss 1911 10mm with Caspian frame and slide. The frame was sold in 2004 to Ellison Custom Guns in El Reno. On one side of the trigger guard up under the recoil spring area there is a "M" stamped, on the other side there is a "S" stamped . I called Caspian and they said they didn't stamp it. Thanks for any help.