I have had some experience in shooting a rifle called a Lee Enfield .303 MK4 rifle many many years ago and have been amazed that such a deadly weapon is available for ownership in the US. I was even more amazed to find that such weapons can be purchased for around $200 - $400.
I got mine 2 years ago for about $75 (actually traded $40 + my old Leatherman Wave), and it is now my SHTF rifle. I have to keep it locked up though. I've noticed it has a tendency, like all guns, to get loose sometimes and float down the street firing all by itself.