Yugo M57 Flare Gun

[Aragorn243]

It's 26.5 mm and they do make an insert for 12 gauge flares. Military flares are available and if you can find them, the prices are less than the 12 gauge flares. The 12 gauge flares can be bought just about anywhere. A few companies state they are "hazmat" and charge quite a bit for shipping. Most don't seem to do that. I'm going to wait till the next gun show and see if anyone is selling them there before ordering online.