I recently purchase this gun and I had an RO from a local range adjust the sight for me. He did pretty well adjusting it, I was able to shoot centered from 3 to 7 yards away. However, one hour later at the range, I noticed my shot was hitting low left — believe me, I thought it was me (at first) for not gripping onto the grip panel tightly. Moreover, I experienced the samething while shooting the shadow 2 at a match or a local range. Therefore, I need guidance on how to adjust my rear sight.