The Radical Firearms complete AR is a fully Mil-Spec AR-15 rifle built using law enforcement grade upper receivers and mil spec lowers. Its 4150 Chromoly Vanadium Steel barrel is Melonite treated for a harder-than chrome finish. 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. It has a Radical Firearms 12" FGS (Forward Guard Shield) Round Rail that has the capability to add attachments other than on the top picatinny rail, as it does allow Magpul Moe attachments and rail sections.