Our M4A1 Clone Complete Lower Receiver features custom engraving on our AR15 Gen 2 Lower Receiver and is the perfect complete lower for your M4A1 clone build.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 markingsSpecifications: Made In America?: Yes FFL SOT Shipping Required: No Platform: AR15 Series: M4A1 Select Your Finish: Anodized Black Receiver Extension: Carbine Compatibility: Works with standard AR15 components and magazinesINCLUDES: M4A1 Clone Lower Receiver Standard Collapsible Stock Standard A2 Grip Lower parts kit Receiver extension Carbine buffer kit These parts are installed