Flechette Gun
From Wiki
A flechette is a small 'nail with fins' used primarily against soft targets like occupants of enemy cars. Fired in bursts like the Machine Gun, you can fill the interior of your target with small high-velocity darts capable of ripping up their bodies.
Best used when the armor is completely gone on the target allowing the flechettes access to the interior.
Flechettes have little, if any, effect on vehicular armor.
