Now that's a gub

A Marine from 1st Marine Aircraft Wing (MAW) 172nd Support Squadron fires a round from a 25mm machine gun aboard dock landing ship USS Harpers Ferry (LSD 49).

Rico says he knows he can't have one, but he wants one anyway...

But in the "the more that things change the more they stay the same" category, there's a remarkably similar 2-inch cannon (a pair of them, actually) sitting on a plinth outside the county courthouse in Media, Pennsylvania, and I've fondled them regularly over the years.
The only difference is that they're externally cranked, and they were made during the Civil War.
I could have had one, but theft of Federal property (and these memorials remain, technically, Federal property) is frowned upon...