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Archived [ARCHIVED THREAD] - 9mm upper question?
Posted: 6/23/2003 8:49:01 PM EDT
Is there any differance between 9mm uppers and 5.56 uppers? I was looking at putting a 9mm AR togather and was not sure about uppers? I was looking at the MEGA matched lower and upper for a 9mm project. Thanks.

Link Posted: 6/23/2003 9:40:40 PM EDT
[#1]
Colt/RRA is different, Oly is similar, but with a special ejector.
Link Posted: 6/24/2003 6:11:28 AM EDT
[#2]
I know Colt/RRA and Oly use two diffrent systems. My question was can a 5.56 upper reciver be used for a 9mm?

Archived [ARCHIVED THREAD] - 9mm upper question?
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