this one would probably be good because it's big enough to cover the area that the old site would leave showing and it would work just fine just make sure you know the diameter of your barrel so you get the right one.
Unfortunately the manufacturer has not provided that information, even on their own site. We recommend contacting them directly, they should be able to provide you with that information. You can reach them here: https://andersonmanufacturing.com/contact-us
It will work on any direct impingement AR15 regardless of caliber, as long as the barrel has a .750 gas channel.