I am also a brutal grader. Not a teacher, but I have a dabbling background in research writing for political science, for which I did a literature review on defensive gun use. I would give you a C- on formatting (Grammar is actually not too bad, but the paper formatting is bizarre. Some paragraphs are indented, some are not, some words are randomly bolded, and you tend toward long paragraphs that have multiple subjects that may only be tangentially related. Those first few issues may be the result of conversion from a word processor document into a .pdf, that happens a lot), a B- on the strength of your argument (It is evident that you did a fair amount of background research, but one weakness there is that instead of tracking down primary sources, you often rely on the research of organizations that have a clear interest in your side of the argument. There is nothing wrong with using these type of sources, but your source credibility is much more likely to be questioned- best to go to your source's sources in those cases), and a C+ overall, primarily because your paper reads like a long list of circumstantial evidence without a clear thesis. I don't blame you for this, all the papers I did on short notice kind of stank... it's kind of a byproduct of deadlines and the desire to simply have something to turn in.
My overarching concern with this paper is that you assume a great deal. Whenever someone posts something like this, it generally gets good reviews, but you have to keep in mind that you're preaching to the choir... who are all prone to the same assumptions you are, because 99% of us already agree with you.
Your conclusion has some problems. You say "Simply put, the current unconstitutional practices of most post-secondary institutions prohibiting the carrying of concealed firearms has now become a constitutional matter, no longer in the hands of politicians and special-interest groups."
1. No court has specifically said that post-secondary schools cannot ban the carry of concealed firearms. But it has not yet (ever?) been found to be "unconstitutional." Heller v. D.C. and McDonald v. Chicago are both riddled with vague possible exceptions that still leave the door almost entirely open to all kinds of regulation... just not outright bans. You're essentially taking your opinion as fact.
Should it be unconstitutional? I think everyone here would agree, at least for government-funded schools. But that hasn't been decided yet.
The other problem with this statement is that this issue has always been constitutional, and without a doubt, that kind of does put it squarely in the hands of politicians and special interest groups.
2. You conclude "The future of concealed carry on campus has become much more probable now that it has become evident that the Supreme Court will make the final decision."
The former part of that sentence is meaningless, and the last part of it is completely unsupported. The future of concealed carry on campus is 100% probable- whether or not that future will involve legal and school policy-approved carry on campus is totally up in the air- but concealed carry on campus does have some future. Of some kind. Furthermore, you never present any evidence in your paper that indicates that the Supreme Court intends to make any decision regarding this issue. It is easily inferred that you think they should, and that you think that they should rule in our favor, but there is no evidence that they intend to even consider the specific issue of carrying guns on campus.
In any case, it's not terrible paper for being done in nine hours, but it's still evident that it was done in nine hours.