Experienced firearms experts fire two shots in rapid succession without spoiling their aim.
Double Tap can only be used with weapons that have a Rate of Fire of 1 and can fire two shots without needing to manually reload. It adds +1 to hit and damage at the cost of one extra bullet. This is per action, so a shooter can Double Tap more than once if she performs a Multi-Action.
Double Tap cannot be combined with Rapid Fire.
If used with a weapon capable of Three-Round Burst, it adds +2 to Shooting and damage instead of +1 and expends six bullets.