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Aero Precisions M4A1 Clone Complete Lower Receiver features custom engraving on their AR15 Gen 2 Lower Receiver and is the perfect complete lower for your M4A1 clone build. M4A1 Lower Receiver Features: Custom Aero Precision logo Markings include: Property of U.S.A., MOD M4 CARBINE, CAL. 5.56MM Serial number designation Safe/Semi/Auto safety selector markings Includes: M4A1 Clone Lower Receiver Standard Collapsible Stock Standard A2 Grip Lower parts kit Receiver extension Carbine buffer kit These parts are installed Gen 2 Lower Receiver Features: Upper Tension Screw - Allows users to fine tune the Mfg: Aero Precision.