Good option with minimal cost - LaRue Tactical Low Profile IndexClips

these plastic index clips are cheap, but work well. I have about a 9 inch pic rail and these number of clips in a container covered the entire rail. Some of the clips have the extra piece to keep light wires out of the way. I did not really use that myself, but seems durable enough to work. I think ladders feel better, but these are a good option and seem to be durable. They are a bit hard to put on though.