Manufacturer: Anderson Manufacturing Model: AM-15 Utility Caliber: 5.56 Weight: 7lbs. Lower Receiver Material: Forged 7075 T6 Aluminum Upper Receiver Material: Forged 7075 T6 Aluminum Upper Receiver Finish: Type 3 Hard Anodized - Black Lower Receiver Finish: Type 3 Hard Anodized - Black Trigger Guard: Open Trigger RF-85 Treated: Non-treated Bolt Carrier Finish: Nitride Bolt Carrier Material: 8620 Steel Bolt Finish: Nitride Bolt Material: 9310 Steel Barrel Material: 4150 Chrome Moly Vanadium Barrel Length: 16 inches Barrel Finish: Nitride Barrel Contour: M4 Contour Twist Rate: 1:8 Gas System Length: Carbine Length Gas System Type: Low Profile Gas Block Diameter: .750 inch Charging Handle: Standard Charging Handle Bolt Carrier Group: Standard M16 Profile Hand Guard Type: M-Lok Handguard: M-Lok Pistol Grip: A2 Style Thread Pattern: 1/2 - 28 Muzzle Device: A2 Flash Hider Buffer Tube: 6 Position Buffer Tube Butt Stock/Brace: 6 Position Carbine Butt Stock Magazine: Magpul PMAG GEN M2 MOE AR-15 .223 / 5.56 30-Round Magazine Optics: Sig Romeo 7 1x30MM