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ar15 upper and lower receiver aluminum

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    Amattern

    Amattern

    Expert
    Rating - 97.1%
    66   2   0
    Jan 4, 2011
    1,291
    38
    Terre Haute, IN
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    Anyone heard of 6061aluminum? being used for a AR15 upper and lower receiver. I know alot of manufacturers use 7075 aircraft-grade aluminum forging, what is the difference?​
     
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