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I couldn't find any 13rd bit 15's are here https://www.budsgunshop.com/search.php/type/magazines/searchattr/2-9167/q/m%26p+40+magazine

Larry, https://www.sportsmans.com/shooting-gear-gun-supplies/gun-parts-magazines/magazines-clips/handgun-magazines/smith-wesson-mp-40c-m20-black-40-sw-handgun-magazine-13-rounds/p/1686921 ------------------------- https://www.ebay.com/itm/333838946219?hash=item4dba5a0fab:g:vJQAAOSwGcFf6Rgn

Larry, here's a link to 13 round magazines that will fit and function. Hope this helps, link here........... https://www.budsgunshop.com/product_info.php/products_id/44684/s%26w+m%26p+m2.0+.40s%26w+13rnd+compact+magzine