During the entire time I was a student at UAA, my greatest fears included not being taken seriously by my professors, missing a class, and being completely taken by surprise on an exam. If you genuinely feel threatened on a UA campus, you need to contact the campus police immediately. 

I was in the military. When you carry a weapon, a certain percentage of your brainpower must be dedicated to minding the state of that weapon and thinking about what that weapon might need to do in the next few seconds. Any person carrying a loaded weapon for personal defense who does not do this is irresponsible, and any person who does do this in a classroom is wasting their class time and their tuition money.

Leave the gun. Take the notes.