9mm upper and 223 upper

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[ARCHIVED THREAD] - 9mm upper and 223 upper

Posted: 11/9/2003 1:55:07 PM EDT

can you use a regular upper to build a 9mm upper unit? I have a flat top and was wondering if you can put a 9mm bolt and barrel on this
unit. Then get a mag block for the lower.

[ARCHIVED THREAD] - 9mm upper and 223 upper

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