This is a Luth-AR Stock known as the MBA-4 Carbine Stock, model MBA-4.
Luth-AR's MBA-4 Carbine Stock Assembly Fits AR-15 & AR-10 Commercial and Mil-Spec Buffer Tubes. It fits all .223 and most .308 AR carbine style rifles. It is a lightweight stock made with super strong glass filled nylon and is easy to replace and quick to install. Features a picatinny rail and a revolutionary anti-rattle set screw.
Features:
Adapts To Existing Commercial and Mil-Spec Buffer Tubes
Fits all .223 and most .308 AR carbine style rifles
