The Adams Arms Gas Piston Upper Receiver was designed specifically for Adams Arms with .180" gas tube hole which allows use of Adams Arms gas piston system without the need for a bushing. Upper receiver is machined from aluminum to military specifications and has M4 feed ramps and T-marked A3 flat top. The entire assembly is then Type III hard coat anodized. Proudly made in the USA!
Upper has forward assist and ejection port cover installed.
Upper is compatible with other manufacturers gas piston systems as well as Direct Gas Impingement operation.
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