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  1. #1
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    Jan 2009
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    RRA 9mm Upper question

    Can anyone tell me if the RRA 9mm uppers will fit right in on one of their own regular AR-15 lowers? Or do you have to have a special lower for it to work? What other considerations, besides obviously magazines, do I need to keep in mind?

  2. #2
    Join Date
    Nov 2007
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    you need a magazine block as well. I like the Hahn top load (meaning the block loads in from the top, not the magazines).
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