Shawn and I both like and use the Knights Armament Corp. ambidextrous safety for the AR15. While not the cheapest, it gives you multiple options for your right side safety lever. As shown in the picture, you can use it as a single sided safety, or as a normal ambi-safety. I really like the scalloped right side safety lever as it doesn’t rub against my trigger finger like the non-scalloped right side safety. If your looking for an ambi safety, take a look at the KAC ambi-safety. A Full-Auto selector kit is also available.