But the AR-15 is not ideal for the hunting and home-defense uses that the NRA’s Keene cited today. Though it can be used for hunting, the AR-15 isn’t really a hunting rifle. Its standard .223 caliber ammunition doesn’t offer much stopping power for anything other than small game. Hunters themselves find the rifle controversial, with some arguing AR-15-style rifles empower sloppy, “spray and pray” hunters to waste ammunition. As one hunter put it in the comments section of an article on americanhunter.org, “I served in the military and the M16A2/M4 was the weapon I used for 20 years. It is first and foremost designed as an assault weapon platform, no matter what the spin. A hunter does not need a semi-automatic rifle to hunt, if he does he sucks, and should go play video games. I see more men running around the bush all cammo'd up with assault vests and face paint with tricked out AR's. These are not hunters but wannabe weekend warriors.”
In terms of repelling a home invasion—which is what most people mean when they talk about home defense—an AR-15-style rifle is probably less useful than a handgun. The AR-15 is a long gun, and can be tough to maneuver in tight quarters. When you shoot it, it’ll overpenetrate—sending bullets through the walls of your house and possibly into the walls of your neighbor’s house.