Dark Storm Industries DS-15 MOE 5.56x45mm NATO 12.5inch Upper Receiver w/MVG Carbine Length 1-7 Twist Black. Perfect for your next Non NFA build. Specifications for Dark Storm Industries DS-15 MOE 5.56x45mm NATO 12.5inch Upper Receiver w/MVG: Manufacturer: Dark Storm Industries Caliber: 5.56x45mm NATO Barrel Length: 12.5 in Barrel Profile: SOCOM Gas System Length: Carbine Length Barrel Twist Rate: 1-7 Barrel Material: Steel Bolt Carrier Group Included: MIL-SPEC Charging Handle Included: MIL-SPEC Features of Dark Storm Industries DS-15 MOE 5.56x45mm NATO 12.5inch Upper Receiver w/MVG Lifetime warranty Fully Transferable No Registration or Proof of Purchase Required Package Contents: Dark Storm Industries DS-15 MOE 5.56x45mm NATO 12.5inch Upper Receiver w/MVG Dark Storm Industries DSI-UC5-MOE-12C7-T5-BLK: DS-15 MOE 5.56x45mm NATO 12.5inch Upper Receiver w/MVG Carbine Length 1-7 Twist Black