When you need a significant upgrade to your AR-15/AR-10 trigger then look no further than Hiperfire's EDT Designated Marksman Single Stage Semi-Auto Trigger. This high-performance trigger features a duplex trigger bow that offers a high position for safety under duress and a low position for tactical precision and also has a pull weight of 4.5 - 5.5lbs with supplied red and green hammer springs. With the Hiperfire EDT installed on your AR you will get a crisp, clean, trigger break, short over-travel, and a fast reset that you will love. Features: a Single Stage Semi-Auto a 4.5-5.5lbs Trigger Pull a Heavy SwingFast Hammer Head a Duplex Trigger Bow a MIL++ Heavy Duty Hammer Springs