You can substitute a low density or hollow tail for the fins if they're a bit too much work to put together. I'm putting together quite an arsenal for when spring comes, and making tails for flechettes is a real b*tch. You may actually be better off just making a 3 piece (two sides, and a back piece) discarding sabot for throwing darts. They fly quite well. If you want to make it interesting, you could use a cannister round filled with a few of them, like this:








