My new DD upper is going to arrive shortly and I will have some rail space that needs filling. I was wondering what the consensus on rail covers was. It seems the xtm is the go-to cover for most but I have heard that the xt covers were slimmer. I have also heard good things about the larue index clips but have never actually seen any in person. Heat will definitely be an issue in the summer so the ladder style.covers might be out of the running.