Board Thread:General Discussion/@comment-172.250.39.94-20131203204915/@comment-3314763-20140604012139

No, I did, in fact, mean 25 mm. They make 25 mm flares, and they are VERY powerful, very effective devices. They mostly serve as smoke flares, but you could make a mageneseium type pretty easy.

I should have explained better, my bad: I was attempting to say you could attach a sheath to a pre-built gun and store a long knife/short sword in it. It would probably be built into the grip, stock, or the underslung lug where the ramrod was traditionally placed. It WOULD require modification, cutting away pieces, and probably would be althogether impractical and usless, but it could be done. As for shooting the blade, I think this would best be accomplished via a powerful  theoben gas spring attached to the inside of the sheath, covered by a wood or polymer false bottom. The sheathing action would re-coil the gas spring, which would be relesed by a small switch that unlocked the sword from the sheath, firing it out at high speeds.