AR-STONER AR-15 Optics Ready Upper Receiver Assembly 7.62x39mm 16″ Barrel

Upper Receiver: A3 Flat-Top
Barrel Length: 16″
Barrel Contour: Heavy
Barrel Material: 4140 Chrome Moly Steel
Muzzle Thread Pattern: 5/8″-24
Chrome Lined: No
Barrel Finish: Matte Black
Twist Rate: 1 in 10″
Chamber: 7.62x39mm
M4 Feed Ramps: Yes
Muzzle Device: A2 Flash Hider
Gas System Length: Carbine
Gas Block Diameter: 0.750″
Handguard: 2-Piece M4 Style
Sights: None
Bolt Carrier Group Included: Yes
Bolt Carrier Type: Mil-Spec