JP's forged receiver set is made using mil-standard processes and coated with Black Teflon for a perfect appearance and lubricity. Both the upper and lower are expertly machined, carrying on JP's high quality craftsmanship. A matched receiver set assures that both of your receivers fit perfectly and have the same external finish. Each upper and lower receiver will also work great with any other AR15 receivers, so you can swap uppers with other lowers you may own. These receivers are stripped, so they require parts for completing the assembly. Made from high quality 7075-T6 forgings Stripped upper and lower receivers Mil-Spec dimensions and processes Works with quality Mil-Spec components Teflon coated Marked with JP's logo