That's called a "Smolt" and if memory serves me right, Skeeter Skelton had one with a 4'" barrel. I believe they are Smith model 19 frames with Colt Python .357 Magnum barrels. They look very good and are rare, custom made of course.
They say imitation is the greatest form of flattery ... or something like that!I see that KimberKid followed HK's manual on loading the magazines.