Help!!!! I sheared my index pin

[montana]

Like Shimming, lap the upper or possibly try a different upper or barrel nut will help correct for lower torque ranges.

Lapping, changing the barrel nut or both, can work, but I have found it doesn't always work.. It helps to know all the options available...I prefer barrel nuts that don't have to be timed to the gas tube.. I'm getting lazy in my old age