I’m not sure if is a GQ (it should have a definite answer) or Cafe Society (inspired by a movie) question.
I just watched The Dogs of War in which Christopher Walken’s character spends some time putting things asunder with a bad-ass weapon called an XM18E1R, also called XM18 for short. It’s a sort of hand-portable artillery battalion, with a gatling gun arrangement for the cylinders.
Does that weapon exist in real-life? Google turned up a page in Japanese (which I do not speak) that had a screen shot from the movie, and that’s it.
Thanks DDG, I should have mentioned that I’d found that already and it’s not the item in question. We also had an early stage of development defensive missile designated XM-18; that’s not it either.
The picture on the Japanese site looks like photos of a Soviet made, automatic shotgun that I saw one time in a magazine. IIRC the US military does have a grenade launcher that looks similar to that as well.