The only way that you can shear and indexing pin, is if you overtorque the barrel nut, or a nut has seized and you try to break it loose. I have done probably a few hundred uppers using a Reaction Rod. The only time I sheared a pin was trying to correct someone else's mistake. They torqued the nut well over 80 ft./lbs. and they didn't use any anti-seize.


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