I used a BSA red dot last year and had a problem with it getting knocked off zero. What caused this I don' t know for sure but it happened twice. Talked to another guy who had the same problem one time, also with a BSA. Other than this I' ve had no problems. I will use a red dot this year but I am looking to upgrade from the BSA. On the up side, the things I like about a red dot are....unlike fiber optic sights the dot appears to be on the target so nothing is out of focus, not having to line up two sights, and you can keep both eyes open so your field of view is not limited by the scope.