Many times you can put the upper receiver in a block (in the vise) and twist the barrel within the upper receiver the way you need it to go. If it's hitting to far to the right, twist the barrel to the right.
I usually just loosen the barrel and retorque it. This problem many times comes from people using barrel blocks (instead of upper blocks) to hold the barrel as they torque down the barrel nut to the receiver. I can also come from overtightened used a vice receiver block.
If it hits too far to the left, they probably overtightened using barrel vise blocks.
Sometimes a new barrel extension indexing pin will fix it, sometimes it requires a new upper receiver.
I would like someday to make a jig that holds both the upper receiver and the barrel perfectly still while the barrel nut is torqued.
Chief Armorer for Elite Shooting Sports in Manassas VA
Chief Armorer for Corp Arms (FFL 07-08/SOT 02)
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