The Blackhawk AR15 Quad Rail replaces handguards with no modifications to the weapon. It's interlocking halves are secured using six screws for extra strength and stability. It has a slim profile for a more comfortable, handguard-like feel, and limited rotation push-button sling swivel attachment points that are incorporated on left and right sides. It also has an unique vent hole design helps dissipate heat and reduce weight.
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