WTH is this that just fell out of my /6?!

73AbodEE said
it does look like a tiawanese special order mushroom headed .38 caliber

It's just slightly smaller (thinner), but slightly longer than a .22LR bullet. When I first saw it on the floor, that's what I thought it was, but I've never had my 22 in the garage, or near my Dart for that matter!