The D18 is a fully-automatic machine pistol available at tier 12. It has an extremely high fire rate (same as MAC-10), decent damage and high zoom.
However it has an extremely high horizontal recoil (albeit quite predictable), even when fired in single shots making this suitable for close range only. However, if given the opportunity to draw the weapon in such a situation, the consistent damage and extremely high rate of fire make it a potent weapon.