The Timney Targa 2 Stage Trigger for AR platfrom rifles is a simple and easy to install drop in trigger designed to enhance the accuracy of your modern sporting rifle. The first stage is set to 2 lbs. and the second stage is set to 2 lbs, resulting in a short, crisp, and controlled trigger pull. This model allows for a shorter pull on the first stage. CompatibilityAll Military Spec Built LowersMossberg MMR HunterMossberg MMR TacticalMossberg MMR Tactical w/sights Timney AR Targa 2 Stage, Short 1st Stage, 2+2 lb Trigger 662S