[rudedog]

double tap, is another perk. You get different perks like deep impact or double tap ( Fridays are the day IW releases a new perk video)

Double tap enables your gun to fire two shots when you press the trigger, thus being able to down your enemy quicker.

Deep impact will enable you to shoot through walls, depending on the weapon you choose and how close you are to the wall or object.

You will get to customize your character in MP with perks or shall I say you earn perks as you play and get kills.