Back when I worked as an intern for the Pennsylvania Historical and Museum Commission I built, from parts that were in stores, two M1895 Potato Diggers to be used in exhibitions. Didn't get to fire them, unfortunately. Couldn't fire them, unfortunately, as the barrels had been drilled as part of the accession process.
There were enough parts to build several more, as well.
I believe that all of that came from the 28th Infantry Division after World War II.