I just bought 2 13RD .40s&w mags for the SC I have from PISTOLGEAR (that site is THE xd toystore and I love it I have a whole wish list for the ol' tax return money) . IMHO MEC-GAR makes the best after market mags one can get and im not quite sure how they fit one more round in but I don't care . Besides the extra round cap I like the finish Im not a fan of the polished mags that the XD ships with and I can't find any SA matte black mags. Has any one run these mags in a XD40 SC with out the xtender sleeve? I imagine they will be just fine. They shipped today I should have them before range day this weekend I will update with a report.