Mylastrook, how did your SR9c shoot with the XS Big Dot sights? I installed mine yesterday, went to the range today and at 10 yards with the sights aligned to the target per XS recommendations I was shooting 9"-10" low. I have a slight gap between the front sight and the slide, I think I will try taking a little more off the bottom of the front sight to see if that will help, my only concern is taking more off the bottom may make the sight loose in the slides dovetail. I love how easy it is to acquire the target with these sights but definitely need to get on target. Any suggestions?