SFS Standard Hair Trigger [reaction] Feat 6

Frequency The last creature you Aimed at since the start of your last turn uses a manipulate action or a move action, makes a ranged attack, or leaves a square during a move action.
Requirements You’re wielding a gun.

You attempt a ranged Strike against the triggering creature. This Strike doesn’t count toward your multiple attack penalty, and your multiple attack penalty doesn’t apply to this Strike.