Another vote for the mighty Kalashnikov. I picked up a Saiga SGL21-61 converted to original configuration by Arsenal Inc years back. I also own a couple of WASR series(one converted to 5.56 NATO), a Yugo M92(current truck gun), as well as a couple of semi RPKs converted to DMR (Designated Marksman Rifle) status. I owned a few AR rifles, and in the right conditions, they failed miserably.
For the truly “reach out and touch someone” I have a .308 bolt gun and a 7mm Mag.
Never challenge a man who has nothing left to lose.