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9mm Upper


JD45

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It depends. In all likelihood you would need to replace the ejector if going from .45 to 9mm. With .40 you might be able to get away with the same ejector given the comparable case lengths of 9mm and .40.

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In another thread L2S mentioned having a 9mm upper fit to a 1911.

What do you have to change when you switch back and forth? I hope the ejector can be left alone.

The same ejector and slide stop can be made to fit both. I have an STI with 9mm and .40 top ends, all I swap is the top ends. I believe it's the .40/.45 slide stop, and you may have to tweak the magazine follower's foot to get reliable slide lock back.

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