9mm upper?

Discussion in 'AR-15 Discussion' started by 99monguse, Jan 6, 2013.

  1. 99monguse

    99monguse New Member

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    My wife wants me to buy a 9mm upper but isn't there more to it then just swapping out the upper and the mag adapter?
     
  2. Wrecked

    Wrecked New Member

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  3. locutus

    locutus Well-Known Member Supporter

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    ooooops.!!!!!!!!!
     
    Last edited: Jan 7, 2013
  4. robocop10mm

    robocop10mm Lifetime Supporting Member Lifetime Supporter

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    High Standard manufacturing in Houston makes them. Upper, mag block and a very heavy buffer are all that is needed. The standard carbine buffer is 3 oz. I run a 6 oz 9mm buffer in mine. Midwayusa generally stocks them.