Is it Colt or a clone?
https://taskandpurpose.com/gear-tech...nade-launchers
It'd be hard to take things apart with smoke and flares. Going to do your own hand loading?
I carried an M79 in The Nam. When the plague money shows up I'm likely to get a Bond Arms double derringer. The 410 0000 buckshot is .38" and you can make eight holes with two pulls.