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Old January 13, 2020, 11:53 AM   #16
jcj54
Senior Member
 
Join Date: February 28, 2011
Posts: 111
Seen this before

If you hold the receiver in a vise block and loosen the barrel nut and put an angle finder on the top of the receiver and then put it on top of the front sight ears you should be able to rotate the barrel assmbly until the angle reading are a close match. Then carefully tighten the barrel nut taking care not to rotate the barrel assembly.
I have found that there is usually a bit of clearance between the pin in the barrel extension and the slot in the upper.
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