https://en.m.wikipedia.org/wiki/Harmonica_gun
I'm watching an old movie and saw Yule Brinner shooting one. I thought gimmick... Not so they were real.

what movie? I'd like to see the scene to get a better idea of how that thing operates

The Browning Museum in Ogden's Union Station has several 'harmonica' rifles build by Jonathan Browning on display.

Pretty amazing.

quote:

Originally posted by Jester814:
what movie? I'd like to see the scene to get a better idea of how that thing operates

Yup Brynner uses a lever action "harmonica gun" in Adios, Sabata. (But it's a mock-up prop gun, not an actual firearm.)