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AR15 Barrel Nut / Gas Tube Alignment Gauge Pin

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American National Firearms AR15 barrel nut / gas tube alignment gauge pin. The round end of pin fits into upper receiver, while the pointed end helps to align the nut visually. Using this alignment method prevents turning the nut too far, then having to back it off to the correct position. The pin is the same diameter as the gas tube, making correct alignment of the gas tube simple and easy.