I think I want to order some XTM rail covers for my 15-22. According to Magpul's site theres 4 panels which is suppose to cover 1 side but I've seen in pictures that they don't cover the complete rail. Is this for attachments like lights thats on the side? Not sure if I want the whole rail covered or not but if I do how many panels would I need for one side of the 15-22?