Find out which firearms have tried to take the crown away from the AR15 and failed in this video from The Firearm Blog... "For decades now, companies have tried to release firearms to dethrone the mighty M16/AR15 rifle. While some attempts have been more successful than others (some enjoying even moderate success), all the ones on this list have fizzled out or seem to be losing most, if not all factory support. While these aren’t necessarily bad firearms, they sure have not outsold the venerable AR15 on the American market (and abroad in most cases)."