AR mags aren't cheap or plentiful any more!! Just try to get one now. Since the Conn. shooting zillions of people have been buying them up. where have you been lately?? and with frangible bullets, an AR-15 makes a great home self-defense gun. I have both shotguns and a .45acp pistol that would not even get my slightest consideration if someone broke in my house. But my AR would be out and loaded in seconds. A .45 acp would penetrate through walls and have a greater chance of killing my neighbor accidentally any day of the week. AR-15 bullets are high velocity but it does not take much to stop them at all!!!