Manufacturer: Radical FirearmsChamber: 5.56NATOContour: M4Fluted: NoBarrel Length: 16"Twist Rate: 1:7Gas System: CarbineDiameter at Gas Port: 0.750"Thread Pitch: 1/2x28Feed Ramps: M4Material: 4140 Chromoly SteelFinish: PhosphateProcess: Button Rifled Barrel Lining: Phosphate Barrel Extension: A4 Assembly: Stripped Weight: 29.4oz from Primary Arms (Product RF-1617)

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