Another ballistic/stealth solution.Pushpins out of a blowgun. You wouldn't believe it, but pushpins fly point first. Terrible trajectory, though. Ballistically inefficient. Good for practice in breath and release control.
I'm tempted to try trimming down golf tees to .41 caliber at the head to see how they fly. (Blowgun is .41)
Beauty of pushpins and golf tees is if you miss, it looks like someone accidentally dropped one wherever it lands. Unlike a real blowgun dart. Which looks like a blowgun dart and generates the idea that someone was up to no good. And you wouldn't want a kid to find one and get hurt with it.
And they even make biodegradable golf tees.
I'm not signing this one so nobody will know who posted it.
ETA: Hmmmm.... these look interesting.... but I suspect their aerodynamics would be bad.... Might be a "point of departure" for further development, though.... hmmmm...
http://www.togetherwemakeitbetter.com/HomePage/2-purchase-each/2-Marchant-TEE.html