Here's a little more about both pistols:
Colt 1991A1: Series 80 junk removed. Slide is lightened down thru the Bomar cut, behind the breech face. You can't see the cuts unless you peer in thru the extractor or FP tunnels -- diabolical. The BoMar is soldered (I guess) in place w/o its dovetail. Slide is flattened and serrated. Trigger is an old Vic International unit, when they were still up and running. I lament the lack of available one piece flat triggers for single stack guns. (Note all the caveats there, I know GunCraft makes flat ones for Paras and that SVI makes modular ones for 1911's). Other parts: EGW Stadium mag well, McCormick trigger group, Wilson beavertail, .110" front sight, Storm Lake bbl, NO FLGR. The gun was my IPSC Limited gun, built circa 1992. It worked well enough to win the Caspian kit pictured above it.
Bruce was indeed the guy who doodled with HK's, and also worked on the Devel Gammon project, among other things. He was a brilliant smith who really thought outside of the box and pushed the envelope. He was able to really analyze and break down shooting skills, and taught me a great deal.
Caspian: built by my friend John Yanek, a great smith who does all machining and welding in house. He learned much under Ed Brown, and IMO has surpassed his teacher. John is a perfectionist, and it shows in the pistol he made for me. He cut the Colt style serrations from a Caspian bald & bare slide. Other features: flat top and serrate, flawlessly fit Bar Sto (one of John's monstrous strong points) with standard .278" GI length link for maximum reliability, perfect slide to frame fit, 4 lb trigger w/Videcki & CMC components, Wilson beavertail, in house machine cut 30 lpi front strap.
I love both guns for different reasons -- one's a fun game gun, and the other is a practical tool with great aesthetics. The Gray gun has about 9k thru it, and the Yanek is barely broken in at 900 rds. I keep meaning to shoot it more.