Well, I did what I consider semi major Gunsmithing today. I replaced the old trigger spring setup (3 springs) in my Savage AR15 today, and So far so good. Trigger moves, Hammer goes forward and the safety works. IF what they claim is correct I went from an 8 pound trigger to one that’s about 4.5-5 pounds. I sure can tell a difference. We’ll see how things go next time I go to the range. If all is well I’ll probably change out the springs in my Colt 6721 as well.