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Posted: 2/14/2006 2:21:00 PM EDT
Has anyone built a 9mm with a Colt style mag block?

I know that a "dedicated" 9mm upper does not have the gas port drilled, but is that the only difference between a 9mm upper and a standard one? If so.. I have a mega upper that has M4 feed cuts on it.. will those cuts interfere with 9mm?

Link Posted: 2/14/2006 4:59:48 PM EDT
Try asking this in the Pistol Caliber Forum. It may get a little more traffic from the people with the answer o your question.

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