From the S&W website:
Product: Smith & Wesson M&P .40
.40 S&W M&P Pistols:
209000: 15 Rd, Mag Safety, Int Lock, Std Sights, 2 Mags: $719.00
109000: 10 Rd, Mag Safety, Int Lock, Std Sights, 2 Mags: $ n/a (California Compliant)
209200: 15 Rd, Mag Safety, Std Sights, 2 Mags: $719.00
109200: 10 Rd, Mag Safety, Std Sights, 2 Mags: $719.00 (California Compliant)
209300: 15 Rd, Std Sights, 2 Mags: $719.00
109300: 10 Rd, Std Sights, 2 Mags: $719.00
209400: 15 Rd, Mag Safety, Int Lock, Night Sights, 2 Mags: $ n/a
109400: 10 Rd, Mag Safety, Int Lock, Night Sights, 2 Mags: $ n/a (California Compliant)
209600: 15 Rd, Mag Safety, Night Sights, 2 Mags: $ n/a
109600: 10 Rd, Mag Safety, Night Sights, 2 Mags: $ n/a(California Compliant)
These are the different model numbers for all the M&P FS 40's.
Just be sure to order the correct model number to get the pistol you want.
Yes, they all come with three grip sizes.
Yes, they will all accept 10 or 15 round mags.