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Twin Shot Knockdown 
Feat 10
Source Pathfinder Guns & Gears
Requirements You're wielding a loaded crossbow or loaded firearm in each hand.
You fire at an enemy while targeting a part of its anatomy that will disrupt its balance. Make two Strikes against the same target, one with each of the required weapons. If both Strikes are successful, the target is also knocked Prone.
Traits
Common
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
GunslingerThis indicates abilities from the gunslinger class.