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

Sons of Liberty Gun Works Patrol-SL upper receiver groups are built to the same exacting standards as the rest of our product line.  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 Cartridge: 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