Wolf Performance Arms Complete AR-15 Upper Receiver 5.56x45mm NATO
- Chamber : 5.56x45mm NATO
- Muzzle Thread Pattern: 1/2" - 28
- Barrel Finish: Ferrotic Nitro Carburization (FNC)
- Twist Rate: 1:7"
- Bolt Carrier Type: 1 Piece with integral Piston Strike Face
- Muzzle Break: A2 Style
