Overload... check your (unloaded) P3AT for a possible problem.... look behind the trigger... there is a pin that connects the trigger to the trigger axis that connects the draw bar to the hammer... if the pin slips down, it will not allow enough trigger travel to release the hammer before the trigger stops on the grip frame...if it is high and in good operating condition, I'd suggest a drop of epoxy to lock it in place...the LCP has a shouldered pin that does not allow this, and possibly KelTec has made a similar change to their newer models