Aero Precision M4E1 Threaded Receiver Set - Anodized Black

This ships fast and free! Includes: M4E1 Lower Receiver in Anodized Black M4E1 Threaded Assembled Upper Receiver in Anodized Black M4E1 Lower Receiver Features: Threaded Bolt Catch Roll Pin - Allows for simple installation of the bolt catch and virtually eliminates the chance to damage the finish during installation (pin included).