Anti-Personnel Bullets

While nearly useless against armored targets, the Mite Anti Personnel Round is devastatingly effective against flesh and blood. Nanites inside the head of the clip autonomically sense when the round has entered an organic target. First, the head of the bullet fragments into several dozen pieces. Immediately, they seek the highest local temperature and, using microscopic pockets of gas, propel themselves towards the warmth, and presumably, the vital organs.