AR-15 Carbine Handguards for Magpul MBUS Folding Sights
thingiverse
I have a set of Magpul MBUS Folding Sights on my AR-15. The rear sight can fold properly but the hanguard keeps the front sight from folding down. I went ahead and notched a void for the front sight to fold down. Since you also need a bottom half of the handguard, I am including an unnotched handguard.
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