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DS ARMS INC. AR15 ZM4 Complete Lower Receiver - Specifications: Machined from 7075-T6 Alloy Forging Mil-Spec Dimension Hardcoat Anodized Mil-A-8625F Type III Class 2 Finish Caliber Marked (Multi-Caliber) Selector Marked: Safe - Fire - Auto A2 Pistol Grip Mil-Spec 6 Position Buffer Tube Standard Carbine Weight Recoil Buffer Complete Mil-Spec Semi Auto Internals