Please Visit our FAQ: (click here) The R9 FAQ Site
http://www.cheaperthandirt.com/ Has them at a good price.Chief
You can always try Midway USA.
Anyone know a dealer with S&W M&P 22LR 12 round magazines for sale....I have some on order from S&W but they are not available at this time.
Forget which forum I read this on but you can take the 10 round mag apart then pull out the plastic spacer at the bottom of the spring and you have a 12 round mag.
I now have my M&P 22 and a spare 12 round mag. Very pleased with the gun, first time out I took a handful of mixed brand & bullet weight ammo and loaded both mags, all functioned perfect except on failure to fire and it was a dud.