Quoted: How would tightening and loosening it reduce torque value?
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I personally have no scientific reason for why it works (although I'm sure that there is one), but it really does work.
Pretend you're in the sandbox kicking down a door and grab that rifle tight and I bet you'll be able to twist the barrel nut loose.....I did it and lost my zero... Not a good option for me if I get in a tactical situation or even going to carbine class 6 hours away with no tools.
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I can't explain your situation, but I've seen cases here on Arfcom of guys actually going LESS than 30# with no detrimental effects. In armorer's class we were taught to stop at 30# if it lined up correctly, and this is considering the rifles will be used in life-threatening situations.
I'd say that you might as well leave your rifle like it is, as it is already put together and seems to function okay. If there had been any damage done, there'd be no way to reverse it now anyway.