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Old November 22, 2012, 11:16 AM   #5
Senior Member
Join Date: September 10, 2007
Location: Racoon City
Posts: 933
My brother put a UTG fixed rear on a flattop 20 inch AR upper. The crossbolt screw would loosen after about 100 rounds. He took it out, rubbed the bolt threads across some soft lead and re-installed the sight and has not had a problem since. Like was said, it gets the job done.
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