Caliber: 5.56 NATOBarrel Length: 16 inchesBarrel Profile: M4Barrel Steel: Chrome Moly VanadiumBarrel Finish: NitrideChrome Lining: NoMuzzle Thread Pattern: 1/2" x 28Twist Rate: 1 in 8"Barrel Extension: M4Gas System Length: CarbineDiameter at Gas Block: .750"Gas Block Type: F-marked Front Sight BaseMuzzle Device: A2 -styleReceiver Material: Forged 7075-T6Receiver Type: M4Handguard Type: M4 with heat shieldsBolt Material: Carpenter 158 SteelBolt Carrier Profile: Full AutoFire Control Group: Panther Polished Trigger (PPT)Grip: B5 Premium GripStock: B5 BravoBuffer Tube Length: CarbineBuffer Tube Diameter: Mil-specOverall Length: 32 inchesWeight (as configured): 6.8 lbs