bdawg; What type of mount/rings are you using?.. are you mounting to an A3 or carry handle? I have several Simmons scopes and have never experienced the problems you described. If your mounting system uses separate rings (not integral as Armalite, ASA, etc..), it could be the rings are not aligned properly. For these applications, I use a piece of 1" solid Aluminum round stock to simulate scope when first installing. A wooden dowel will also work. Install this device as you would a scope, tighten rings, remove, and install scope. Also, ensure that care is taken to tighten all screws in alternating sequence, little by little. It doesn't take much to bind the scope. Take 03's advice and do a "total" reinstall.. if problem persists, contact Simmons. I have never heard any negative about their warranty or customer service. Good Luck! Bravo5-2