|Mastermind: Sharpshooter||Tier 4|
|Basic (4 pt): Hitting 3 headshots in less than 6 seconds will refund 1 bullet to your used weapon. Can only be triggered by SMGs, Assault Rifles and Sniper Rifles fired in single shot mode.|
|Ace (8 pt): The amount of headshots required is reduced to 2.|
With this skill Sniper Rifles, along with Assault Rifles and SMGs fired in single shot mode, are capable of regenerating ammo upon achieving a certain number of headshots in a 6 seconds. The basic version requires 3 headshots while the aced version requires two.
For builds that require use weapons that don't have large amounts of ammo this skill can significantly increase the time a weapon can be used before requiring a refill from an ammo bag. Weapons that have a low ammunition reserve, such as the Thanatos .50 cal, when used with this skill and by an experienced player, can be used much longer, especially when the skill is aced. As such, Ammo Efficiency may be best paired with skills that boost accuracy and stability, such Marksman and Stable Shot, due to the skill demanding precision. Alternatively, High Value Target can increase the damage on marked enemies thus potentially requiring less ammo to kill and Aggressive Reload to assist users in dealing with enemy swarms.
Nevertheless, players should be wary of Tasers due to their ability to make electrocuted players waste valuable ammo.