lol **one of** is the key word there.
Meanwhile here is a picture of one of the most powerful rifles one can buy. This one has a muzzle energy nearing 8K ft lbs and as such delivers 8x the power of an AR-15.
It is a 460 Weatherby magnum. Despite being 8X more capable and would actually be far more useful in war than an AR-15 could ever hope to be, you will never hear people complain about this gun.