AFG 4 inch handguard
thingiverse
I tweaked the original model in FreeCad, shrinking it down and carving out a slot so it would snugly fit my M-Lok handguard using just one M-Lok slot. I also revamped the front M-Lok locator tabs to mirror the authentic Magpul locators more closely. This rail mounts perfectly onto the 4-inch rail found here: https://ar15discounts.com/products/nbs-free-float-m-lok-handguard/
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