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Archived [ARCHIVED THREAD] - AR-9mm & .223 uppers
Posted: 12/20/2003 8:53:10 AM EDT
I want to know if the 9mm upper receivers are interchangeable with the .223 upper receivers? Could someone tell me please. I would like to mount a 9mm BBL. on my .223 receiver. Thanks, Mark

Link Posted: 12/20/2003 9:41:28 AM EDT
[#1]
The 9mm barrel will work w/ the 223 upper rec.  The only difference between the 9mm and the 223 receiver is, the 9 does not have the forward assist or the brass defelector cast into the upper.  It has a plastic one that is held on via the ejection port cover and there is no hole for the gas tube to go through (if I recall).
Archived [ARCHIVED THREAD] - AR-9mm & .223 uppers
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