Should be named 3 stage trigger - Stern Defense H2S Hybrid 2 Stage Drop In Trigger

3rd stage is when it breaks with less than 150 rounds of standard 55 grain 5.56. Pretty disappointed in this product after seeing all of the reviews. While it worked, trigger had a very clean first pull, and a great second pull. Tried it with original spring first trip to range, and went to green spring on the second trip. After a couple mags trigger simply wouldn't reset. Pulled it apart to find back side of the trigger had broken off.