Inspected and prepared for immediate use; Made from 7075 T6 aluminum for toughness without added weight; Complete Upper Build: Includes all necessary components for your upper assembly; Phosphate-Coated Bolt Carrier Group: Resists corrosion for long-lasting performance; Midlength Gas System: Ensures reliable cycling and smoother shooting experience; Enhanced Power and Function: Adds serious capability to your AR-15 build