In it original make up it was a fully automatic military assault weapon, later modified for non-military use by turning it into a semi-automatic supposely with something of a fixed magazine, apparently the fix magazine model has now been modified to allow for the removal and exchange of magazines. As to my take on the AR-15 being a hunting rifle I will pass on to you the same commend I made to and other individual who inquired amount another rifle with the AK frame.
The point of the AK/AR type rifle is to ensure adequate fire power not necessarily accuracy. It's a case of spray, and pray that you hit. If it's accuracy and range you are looking for, you would be better off with a more stable receiver and a larger bullet at least .308 caliber. I'm always amused with those who talk hunting, and look with longing at semi-automatic rifles with a large magazine capacities, my statement to them is, " What's wrong can't hit the game with the first shoot." Hunting is about having the patience and taking the time to make the proper shot placement, its about making a clean quick kill, in most cases that is usually achieved by one well placed bullet. Attempting to machine gun or buckshot a fleeing deer as it streams through the woods shows a real want of hunting ethics.