The M4E1 Complete Lower Receiver is the perfect base for your custom AR15 pistol build. This complete lower features Aero Precision's new M4E1 Lower Receiver with an A2 Grip and Enhanced Pistol Receiver Extension. M4E1 Stripped Lower Receiver – Anodized Black A2 Grip – Black Mil-spec Lower Parts Kit Enhanced Pistol Receiver Extension AR15 Carbine Buffer and Spring All complete lower receivers are transferred as ""OTHER"" on the Federal 4473 Form. Although this product is labeled a ""Pistol Complete Lower Receiver"", it is not technically a pistol until it is fully assembled in to a pistol configuration. St Mfg: Aero Precision
