This Anderson Manufacturing complete upper receiver has the following specs:
COUNTRY OF MANUFACTURE: United States
UPPER RECEIVER MATERIAL: Forged 7075 T6 Aluminum
RECEIVER FINISH: Type 3 Hard Anodized, Black
BOLT CARRIER FINISH: Nitride
BOLT CARRIER MATERIAL: 8620 Steel
BOLT FINISH: Nitride
BOLT MATERIA:L 9310 Steel
BARREL MATERIAL: 4150 Chrome Moly Vanadium
BARREL LENGTH: 7.5 Inch
BARREL FINISH: Nitride
BARREL CONTOUR: Government Profile
TWIST RATE: 1:8
GAS SYSTEM LENGTH: Pistol Length
GAS SYSTEM TYPE: Low Profile
GAS BLOCK DIAMETER: .750 inch
CHARGING HANDLE: Included
BOLT CARRIER GROUP: Standard M16 Profile
HANDGUARD: M-Lok
HAND GUARD LENGTH: 6.75 inch
THREAD PATTERN: 5/8 – 24
MUZZLE DEVICE: Knight Stalker Flash Hider
COMPATIBILITY: Standard Multi-cal Lower Receivers
No FFL required, this can ship directly to you.

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