I asked this question in the xdtalk forum and did not get an answer.
Does anyone out there have the Mec-Gar 18 round magazine? Any problems with them? Do they flush fit in the Service model? I have the Sub-Compact and am interested in buying one if I can put the mag x-tension on it and have it flush fit.
I bought an XD9 sub. I hate the 16 round mag with the spacer because it doesnt feel solid. I normally carry my G23, but if I do carry the XD I use the 10 round flush fit. Sorry I didn't answer your question.