Quick google of your title https://smith-wessonforum.com/smith-wesson-sd-sigma-pistols/451271-sw9ve-vs-sd9ve.html https://smith-wessonforum.com/smith-wesson-sd-sigma-pistols/463424-sd9ve-vs-sw9ve.html https://smith-wessonforum.com/smith-wesson-sd-sigma-pistols/595372-sw9ve-sd9ve.html
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not the same base plates) however the SD9 series has a more ergonomically enhanced frame, standard rail system, better slide milling, will accept M&P sights and has an improved trigger
You can cut a new notch in an inexpensive surplus M9 mag. Looks funky but works reliably. Battlefield pick up in Astan and gun has only one factory mag. Attached File
I'm in no hurry to find out now. i was able to source another OEM 15rd mag at the LGS. The owner mentioned he had box full of miscellaneous magazines, and I just had to dig through it to find the mag. I was able to score an OEM 15 rounder for $17!