And if you wanna go for high kinetic impact, there's always the disposable, one-use railgun.The main thing with electromagnetically accelerated projectiles is that the barrel tends to bend in the wake of the projectile, but with a cheap disposable that's ok.
Imagine the toy below, speeded up cca 1000 times, with a nice plasma tail as it overheats the air in its wake, and delivering ...uh... dunno, half a megajoule to the target. Not bad for a hand-weapon.
.
Bet the recoil will be a of a problem, heh.