I was just reading reviews for Smith & Wesson M&P9 magazines on the brownells sight, and there are numerous reports of M&P magazines with the springs installed upside down, directly from the factory. If you own a M&P, I would urge you to dissemble and clean your mags to make sure the magazine spring is installed correctly.

http://www.brownells.com/magaz...%2520Wesson__M%2526P

Thanks for the notice.

Pistol magazines are part of the gun and should always be disassembled and cleaned when the rest of the gun is cleaned. It may not be immediately obvious of the springs are installed upside down, but it is usually apparent if one pays attention to them.

Lol. Yeah man, stuff happens. A federal agency had a pretty large panic a few years ago because a crop of new replacement mags were having failure after failure. They got shipped new magazines and the problem went away.

Upon inspection the springs were installed incorrectly.

So, yeah it happens.

KAHR magazines have had the same issue for years.

They must drop off mags/springs at the receptionist desk and ask them to assemble mags in their down time. No explanation for this ...