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Problem installing my M4's frnt night sights

Mr. Shotgun

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I just installed the rear Meprolite night sight and had no issues.



I then moved onto the front one and couldnt tighten the nut tight enough.... what size is the nut anyway? I notice its less than 1/4 inch. By the way I used pliars to loosen the nut (dumb i know, I scratched up the nut a bit)


What size open end wrench do I need?

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