If you’re going to make the argument that you could use an AR15 for hunting, then you have no idea what you’re talking about.
The AR15 is a .223, or simply a .22, which is not suggested for hunting because it’s TOO SMALL A CALIBER. There is not a case on earth you need an AR15 in civilian hands.
It’s all about shot placement. Even if you used a 308 or 270 and shot the deer in the back of the leg, it won’t die. A 77gr .223 hitting a deer in the “kill zone”(heart, lungs, spine, etc.) will drop a deer almost instantly. .223 is also a perfect round, due to the fact that it has such a low amount of recoil, follow up shots(if needed) can be placed easily. This is very useful when exterminating a pack of coyotes.
I’ve taken wild boar with the .223. Not the best, but it’ll get the job done. Shot placement is definitely key.