the original U.N.C.L.E. gun based on a Mauser handgun. It appeared in some first season shows, but was discontinued because it jammed frequently, and because all the attachments seemed to visually overwhelm the gun.

the more famous U.N.C.L.E. gun, the one based on the Walther P-38.  This is a great shot because it shows the gun fully assembled, AND in disassembled components.

the U.N.C.L.E. Special in carbine form static

one of it in context being held by Solo

an illustration from a late 1980's catalogue for The Collector's Armory