Recently picked up a 9mm EZ for the wife. Put about 3 or 400 rounds of Federal & Winchester 115g through it and have had the slide lock back while firing. The slide will cycle back and the slide lock will pop up as if the mag is empty when it's not. By simply pulling back on the slide the lock will pop back down and you can keep firing. It's only happened 4 or 5 times so far but I wanted to see if anyone else might have experienced this.