I left the light off my AR. A shotgun is my home defense and the light is on that. I think the smaller lights with the built in mounts are much better and lighter with less fiddly parts to mess with and all the mount screws use the same wrench or better yet decent thumbscrews where no tool is necessary to mount and dismount the light. Getting it onto the left side where you can reach it with your support hand and not interfere with a sling or sling mount is another consideration.