Complete .338 Federal Flattop Upper Receiver with forward assist and port door. Precision machined form high tensile strength 7075 T6 aluminum forgings, hardcoat anodized.
Thread Size: 1-7/16" X 18 UNEF-3A
Caliber: .338 Federal
Upper Receiver: A4 Forged Upper Receiver 7175-T74 Aluminum
Finish: Hard Coat Anodized