Our mil-spec 80% lower receivers are manufactured from 7075t6 aluminum forgings from Cerro Forge. They are offered in black anodized and “in the white” (raw), and Cerakote can be added. Please note: Some states may not allow you to legally manufacture a firearm without a serial number (like the state of NJ and Washington DC). Please be sure to do your due diligence and make sure you are following your state and local laws before attempting to manufacture a firearm. This is not intended and should not be construed as an advertisement or offer for sale of any of our products to New Jersey or Washington DC residents or any person in New Jersey or Washington DC.