Renegade plus upper: when pof decided to make a direct impingement rifle, it couldnt be another me-too carbine.The renegade plus upper embodies everything a direct impingement ar-15 can be.With improvements such as our roller cam pin and patented heat sink barrel nut, these upgrades go well above mere aesthetics often found in rifles today.Put simply, the renegade + addresses all of the weak points of the direct impingement system.The dictator 9-position adjustable gas block gives you ultimate control of your rifle, whether tuning for ammo load or suppressor use.The straight gas tube eliminates heat build up from the weak points of standard gas tubes.And the roller cam pin ensures a smooth and more reliable relationship with the upper receiver.Receiver Finish: Black Hard Coat AnodizedCaliber: 5.56x45mm NATOSights: None, Optic ReadyBarrel Length: 10.50"Barrel Material: 4150 Chrome Moly Vanadium SteelBarrel Finish: Black NitrideHandguards: 9" M-LOKHandguard Finish: Black AnodizedBarrel Length Range: 10" to 10.99"