Anything I should know about attaching a sight to a picatinny? I'm not ready to sight in or anything yet, just would like to get the red dot on the AR for show-and-tell. But I don't want to get it on there wrong or unneccessarily scratch things up. It would seem like the screws should rest in the divets in the rail but they don't seem to? I googled and couldn't find anything so maybe this is a really dumb question. Just remember, I'm a pistol guy .