AR-15 Barrel Mounting Shims (4)

I put a flat top upper on my AR and when tightening the barrel nut I had a choice of 25 ft/lbs or the next notch was about 75 ft/lbs. I've been working on cars and other mechanical stuff my whole adult life. In my educated opinion, 75 ft/lbs is too much for this fitting and I don't care what the official military manual states. Most lug nuts only torque to 80 ft/lbs. So I bought these shims and installed one and torqued the barrel nut in at about 40 ft/lbs which in my opinion is a more reasonable torque. Needless to say, I'm well satisfied with the set up.