At one time (maybe 20 years ago--time flies) Clark Brothers had a Gatling gun in their store, if I remember correctly. I do not remember seeing another one anywhere except in the museum at Ft. Riley, Kansas. Anyhow, I seem to remember the one at Clark Brothers was in .38 special. It was full size but it was just a plaything.
Parker is the name everyone remembers from Cuba in 1898 but there were other interesting characters around. There was a small detachment of Colt machine guns that had been purchased by a New York volunteer by the name of Tiffany, of the Tiffany jewelry store family, and brought along with his unit, which was probably the Rough Riders. They happened to be in 7mm Mauser for some reason, which the Spanish were using. Clark Brothers has one of those on display, too.
Shoot low, sheriff. They're riding Shetlands!
Underneath the starry flag, civilize 'em with a Krag,
and return us to our own beloved homes!
Buy War Bonds.