I bought one of these a couple of years ago and installed it in my LR308, So this is a long term review of this product. At the time I had to wait on it to arrive because they couldn't keep up with orders. They have also come down in price by about $50 since I bought mine. They are one piece units that drop right in. they are factory tuned and no adjustments or other tinkering are needed. Install the 2 pins that come with it check for safety and you're done. It is a light and crisp AR trigger with a short reset and has helped me shoot much better. These triggers are right there with good optics and ammo in the quest for AR accuracy.