12 September 2021

Sometimes You Eat The Bear

FuzzyGeff's AR carbine has used almost all of the windage travel to get it zeroed.

That's often a sign of a canted front sight base.

Very often, there's enough play in the barrel indexing pin slot on the upper that if you apply counter-torque to the FSB you will correct for the cant.

So I made the attempt.

The slot is very tight so no change was made by counter-torquing.

I could make the slot wider...  But it zeros at all and making that slot wider can lead to other problems.

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