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If you are talking about the the cut-out area on the back plate, that is there so the slide will clear the ejector for disassymbly. My XD40 Tactical has it. If the 9 doesn't have it, then I would have to guees it is because the ejector sits low enough to clear. 556mm |
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Hot That's exactly how my XD40 looks (it's sitting right next to me  ).
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