The Radical Firearms complete AR-rifle is a fully Mil-Spec AR-15 rifle built using our law enforcement grade upper receivers and mil spec lowers. The 4150 Chromoly Vanadium Steel barrels are Melonite treated for a harder-than chrome finish without chrome's accuracy robbing side effects! This same finish is applied to the bolt carrier groups, helping to reduce receiver wear and increase reliability. The bolt heads are MIL-STD and MPI for quality assurance. The full-length, free float handguard keeps your hands cool and provides plenty of room for accessories. As an added touch, we are adding a Radical Firearms 12" FGS (Forward Guard Shield) Round Rail that we built from scratch in-house! The FGS rail even has the capability to add attachments other than on the top picatinny rail, as it does allow Magpul Moe attachments and RF rail sections.