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What is the screw size for rails that attach to the USC? I don't have a thread gauge, and thought it would just be easier to ask here. thanks.

Scottoe.
 

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Take it down to Home Depot and use theirs ;)
They might even have something that would work but I would try Ace if you have one,
they usually have more metric stuff.
 

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M5 metric, IIRC for both the top rail and front rail hard points. (definitely for the front rail hard points though)
 
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