American Tactical Imports 
https://www.americantactical.us/

American Tactical Imports (ATI) is a worldwide importer of firearms, ammunition and tactical gear. We stopped at ATI’s SHOT Show booth looking for the newest product to show you. They were most excited about the new hybrid AR lower, so we checked it out. It’s a good-looking piece that combines polymer with molded-in steel inserts at critical points like the buffer tube takedown and the trigger group mounting screws. It’s lightweight and comes either as a stripped lower, so you can add your own parts, or as a complete lower with a retractable rear stock. MSRP is $50 for the stripped version and $170 for the complete lower.