My M&P40 has a serial no. prefix of MPA22xx and after my intial trip to the range, it had the somewhat common issue of the slide locking back on a partially full magazine. I sent it out to Smith&Wesson on 02 Jan 07, and it showed up back at my front door today!
They replaced the slide stop and striker assemblies. NOW THAT WAS FAST!!! After I test it out, I will let you guys know how it works now.

They replaced the slide stop and striker assemblies. NOW THAT WAS FAST!!! After I test it out, I will let you guys know how it works now.