Last week I purchased a M&P 380 Shield EZ. Went to
the range today to put some rounds through it. When firing the pistol, I noticed I was firing the pistol with the thumb safety in the safe position. Upon further investigation, the safety worked as it should as long as the grip safety wasn’t depressed. When the grip safety was depressed, it would fire with the safety on. The pistol is on its way to S&W for service. It will be difficult to have trust that any gun safety is really “safe”. Just wanted to pass on today’s experience. Thanks.