Assault weapons are illegal and have been for years. It sounds like you are looking for a semiautomatic rifle. I am neither an AK nor an AR guy. But someone should be along shortly to help you.
“If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.” ― Samuel Adams