Tac-Con 3MR trigger assembly for an AR-15 with an 3 Position safety selector is compatible with weapons using AR-15 small pin .154″ mil-spec style fire control groups. The Tac-Con 3MR is a drop-in 3-mode fire control system with Safe, Semi-Automatic, and Tac-Con’s patented 3rd Mode. The 3rd mode has a positive reset that dramatically reduces the split times between shots.