Welcome to the forum, and play it legal. Anything other than that is not advised and at your own risk. It is alarming that somebody would be so bold as to announce that he is breaking the law and carrying a gun. I almost wonder if it was just a front, and he was just trying to seem "tough" or something by making it up. And depending on how he was asked to leave, that's a whole nother' issue in itself. Keep your wits about you, and pay attention to class, as well as everything else around you. I would be uneasy with that guy behind me in class for sure.
Since you've noted you've been watching the forum for quite some time, I'm sure you know with whom your ideals align with already when it comes to controversial topics, but pay attention to guys like EEllis, Mojo, ShootDontTalk, KeithB, and AnygunAnywhere. They are full of knowledge, and usually leading a good debate with other big shots around here. Have fun!
(Edited for Grammatical Updates)