re: #112 Political Atheist

The .223 is not the same as the military round 5.5645mm NATO of the same caliber/diameter & overall shape. The military round has more pressure and powder. It is very dangerous to put mil spec ammunition in a .223 gun. It can blow the breech.

They look the same except on the bottom.

There are semi-autos that can handle mil-spec ammo safely. But you have to do your research to find one and then make sure its right for you. As ever, don’t believe the marketing hype, instead shop smart.