FN Herstal (FNH) M4 Carbine Complete Lower Receiver Assembly - 5.56mm NATO
This FN M4 Carbine marked complete lower receiver assembly is built on an AR-15/M4 pattern lower and is ready to pin to a compatible upper. The receiver features M4 Carbine / 5.56x45 NATO markings and a UID-style label with manufacturer code information.
Configured with a Rock River Arms trigger and Rock River Arms buttstock, plus a Magpul pistol grip. Includes one 20-round magazine.