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Posted: 6/24/2003 6:19:46 AM EDT
My question was can a 5.56 upper reciver be used for a 9mm? I was thinking of putting a 9mm project togather. Is there a differance in the Colt and Oly system in regards to the upper reciver?
I was looking at the Matced MEGA upper and lower recivers and thought that it would be cool in 9mm. The upper and lower is $170 shipped.

Link Posted: 6/24/2003 9:01:28 AM EDT
I can only speak to the Colt style, but yes you can use any upper. Just mount your barrel and I would suggest getting the gas deflector and installing that as well. It fits on uppers with the brass deflector just fine.
Link Posted: 6/24/2003 10:57:55 AM EDT
Oly upper needs a through-hole drilled for installation of the 9mm ejector. Other than that, any upper CAN work with 9mm. A true Colt factory 9mm upper has no forward assist.
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