[762X51]

Are you asking if you can shoot 40 with the 9mm ejector & extractor installed? Or the other way around?

 

[762X51]

No. If I remember correctly the 9mm's slightly bent inward ejector could strike the primers of the 40 I wouldn't do it.

 

[762X51]

Extractor might work but I see no reason to change b/c the 40 extractor will work with the 40-9 conversions