JR-15 Mk 5 Mod 4 80% Lower Receiver
This Freedom Forge Armory 80 percent lower is not an FFL item and is classified by the ATF as a non-firearm. Made from 7075 T6 heat-treated aluminum, this lower features flared and broached magwells and is "finished in white", tumbled and ready to be bead blasted before anodizing or KG Gunkote. All that's required is machining of the trigger and the safety well before it's a fully functional, mil-spec lower receiver. These are the same raw billets that all of our 5.56mm Joint Rifles receivers are machined from.
The Mk5 Mod 4, 80% Lowers comes with a tension screw hole drilled and threaded for a 1/4"x28 set screw.