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M4 top pic rail screw size


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Can anyone tell me what size screw plugs I need to cover the top pic rail holes in the receiver of an M4.   I am planning to remove the top rail for a more streamlined look and since I really like the ghost ring sights. I’ve heard 8-40 will and won’t work.  Any help ??

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  • 3 weeks later...

Yes they shot loose I expected them to, under the rail when I removed it and the screw holes were very oily. I just removed a couple to install my new venom mount and so I’m going to clean them all up and put a tiny drop of purple loctite. 

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