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I assure you the sights are not fake. I bought them from academy....

Yes sir that is the Pin. I have never had it happen until then. JB weld on the ends have fixed the problem.

I own a few sets of the polymer Magpul mbus flip up sights and they have always worked well for me. While out shooting two weeks ago I noticed that on the AR that I was shooting, the rear sight had a pin that was starting to walk out. It’s the long pin on the part of the sight that doesn’t flip up. I pushed it back in and the sight never lost zero. I have never had this happen on the others that I own so I decided to just JB weld the ends of the pin to the sight itself so they can’t walk out. I thought I’d pass the info along. That way you can keep an eye out on yours if you use them.