I recently got couple of extra mags for M&P from cheaperthandirt.com. It was a" ProMag S&W M&P9 Magazine 9mm Luger 17 Rounds". I took a private and instructor pointed out several flaws in it.
1. It needs a little extra push, it does not go through smoothly like factory mag.
2. The bullet on top was sticking more than the factory mag.
3. The instructor showed that this may be a 40mm mag that has been bent in the the top to fit 9mm. He mentioned not to use it for self defense but only target practice. I am planning to ditch it in case it damages my gun.
1. It needs a little extra push, it does not go through smoothly like factory mag.
2. The bullet on top was sticking more than the factory mag.
3. The instructor showed that this may be a 40mm mag that has been bent in the the top to fit 9mm. He mentioned not to use it for self defense but only target practice. I am planning to ditch it in case it damages my gun.