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The 80 percent AR-15 Lower receiver bulk packs cnc machined from 7075-T6 forgings to Mil-Spec Machining Tolerance. The Lower Receivers’re then Bead Blasted and Hardcoat Type 3 Anodized Black for a lasting finish that is chip resistant and does not compromise the specifications like a thick coating such as powder coating would. The Rear AR-15 upper receiver lug pocket is machined also to do dry fit on upper when checking for play between the lower and upper.