I just got a new xd9 subcompact in od green. I noticed during my first range trip that it wasn't locking the slide open when the mag emptied. back home I tested it with a few bullets and it did fine. Well today at the range, it was doing it some more. The more I kept thinking, I realized that my grip is the problem. When I tested the gun, I did it with one hand, aiming at the dirt. At the range, I use two hands, and my thumb isn't allowing the slide lock to go up. Is this a common mistake? I was about to send my gun to Springfield to fix it. I'm glad I didn't!