Sons of Liberty Gun Works 13.9 in Patrol SL Upper Receiver Group w/NOX mount FSB 5.56mm Black

Sons of Liberty Gun Works 13.9 in Patrol SL Upper Receiver Group w/NOX mount FSB 5.56mm Black. These feature 1:7 twist 4150CMV Nitride finished barrels with true 5.56mm NATO chambers taper pinned F-marked front sight bases Magpul SL handguards and a Magpul MBUS3 rear sight included. Specifications for Sons of Liberty Gun Works 13.9 in Patrol SL Upper Receiver Group w/NOX mount: Manufacturer: Sons of Liberty Gun Works Caliber: 5.56x45mm NATO Barrel Length: 13.9 in Barrel Twist Rate: 1-7 Finish: Nitride Color: Black Fabric/Material: 4150CMV Package Contents: Sons of Liberty Gun Works 13.9 in Patrol SL Upper Receiver Group w/NOX mount Sons of Liberty Gun Works PATROLSLUPPER-13.9-556: 13.9 in Patrol SL Upper Receiver Group w/NOX mount FSB 5.56mm Black