I started running ammo out of both magazines today. The short magazine ran just fine every time. The extended magazine ejected after every shot for the fist three rounds. The last four ran without a problem. I showed the gun to one of the guys behind the counter at the range to take a look. He noticed the mag release wiggled front to back as if it were too small for the opening as he did this the mag fell out. I am going to contact S&W about it tomorrow.