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Old January 2, 2020, 01:17 AM   #2
Senior Member
Join Date: February 13, 2006
Location: Washington state
Posts: 13,993
At first I thought you were talking about the white lines not lining up with the corners of the aperture! (I know, now that's all you will think of!)

Front of the receiver is probably out of square. If you know someone who has an AR lapping rod, just lap the front of the receiver. If you pull the front sight pin and it's tapered, see if you can put it back in from the other side.
Never try to educate someone who resists knowledge at all costs.
But what do I know?
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