people walk around open carrying guns all the time here. what are you going to do about it? NOT allow them to? Anyone can walk up to anywhere with a sniper rifle. It's their right, unfortunately.
Also (unrelated) my dad dropped a white tail giant buck with a .243 from like 300 yards on our ranch and I witnessed it when I was like 9 and, folks, that was pretty sick. and I don't even like shooting animals for fun. it's (the mounted head) the only thing I have "claimed" from my family when my folks kick the bucket since I was there to see it.