I'm not sure where I'm going wrong. I'm doing dry fire drills with a GenII Glock 17. Everything is stock except for the night sights. More often than not when I'm doing dry fire practice with a shell casing on the front sight it jumps off as soon as the striker drops. There is a slight angle to the front sight, I'm not sure if this is affecting it, or if I just need to choke up my grip more. Thoughts, suggestions?