Technical Information Upper Receiver: A3 Flat-Top Barrel Length: 16" Barrel Contour: Government Barrel Material: 4140 Chrome Moly Matte Muzzle Thread Pattern: 1/2"-28 Chrome Lined: No Barrel Finish: Chrome Moly Matte Twist Rate: 1 in 9" Chamber: 5.56x45mm NATO M4 Feed Ramps: Yes Muzzle Device: A2 Flash Hider Gas System Length: Carbine Gas Block Diameter: 0.750" Handguard: 2-Piece M4 Style Sights: A2 Fixed Front Bolt Carrier Group Included: Yes Bolt Carrier Type: Mil-Spec from Midway USA (Product 108623)

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