The design can be found on makerworld.

I printed this gun that fires salt to kill flies. A bug-a-salt gun knock-off that works quite well.

https://makerworld.com/en/models/1072362-flygun-10125s?from=search#profileId-1062485

Worth mentioning. The best ammunition for this gun is coarse salt/kosher salt and couscous. Fine table salt should be avoided.

You are correct.. it's almost a melee weapon

I have printed too much junk already.... I am trying to be more selective with my prints now, by reading the comments usually.

I obviously can't take credit for the design.. that goes to some clever French man who managed to reverse-engineer the original design.