The Union doubles I know of are sideplate guns with the lock parts all mounted in the frame --

[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]

As to where they are, they were essentially a POS when they were built and most have been reduced to scrap.

Last edited by Researcher; 08/28/23 02:15 PM.