The radical firearms complete ar-pistol is a fully mil-spec ar-15 pistol built using law enforcement grade upper receivers and mil spec lowers.The 4140 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.This model has a 10.5" barrel, radical firearms 10" rpr handguard with magpul m-lok slots on sides and bottom of the rail.Metal Finish: Black Hardcoat Anodized/Black NitrideType: AR PistolAction: Semi-AutoCaliber: 5.56x45mm NATOBarrel Length: 10.50"Capacity: 30+1Grips: Black PolymerSights: None, Optic ReadyOal: 26.12"Stock Finish: BlackStock Type: Buffer TubeBarrel Length Range: 10" to 10.99"