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AR15.COM
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3/9/2013 9:47:39 AM EDT
I ordered 2 of the YHM Lightweight Handguards,  they arrived and on one of them on the muzzle end at the end of each rail is a threaded hole(quad rail 4 threaded holes)  and on the other handguard their is only 1 threaded hole on the bottom.  Which one is right?  what are the purpose of each of these threaded holes?
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