I have three NIB mags for trade. Reference S&W part number 190580000. These fit several models according to 2 websites I checked to include 39, 439, 539, 639, 909, 952, 3904, 3906, 3944, 3946.
I also have three MK9/K9 mag sleeves that can be modified to flush fit these mags in a 3913 or other 8 round similar firearm. I gave up on the mods as I have ongoing effects of carpal tunnel surgeries.
Looking to trade straight up (one or one) for NIB or ANIB 8 rounds mags for the 3913.
Thanks for looking,
Bob