A modification to a trigger assembly for an AK style firearm having a trigger with sear and a disconnector pivotally coupled to the trigger, includes a secondary disconnector pivotally coupled to the trigger rearward of the disconnector and movable between a limiting position toward the disconnector and a non-limiting position away from the disconnector. A selector bar is movable between a front position, engaging the trigger to prevent rotation thereof, a middle position allowing the secondary disconnector to be biased into the limiting position engaging the disconnector, and a back position engaging the secondary disconnector and retaining the secondary disconnector in the non-limiting position against the bias and spaced from the disconnector.