So, it looks like I'm stuck with contacting the campus police or trying to find a range to store it.
I think that's a good call. I get the impression that many folks who responded may not have lived in a university environment for some time.
The key issue is not the contract - the contract matters not even in the slightest degree. The wording of the contract matters not even in the slightest degree.
The key issue is whether or not the housing falls under the domain of university discipline. If it does, then an infraction may throw you into the domain of the student judicial system.
In the student judicial system, you won't have a presumption of innocence, or be subject to written laws of any kind. You may be judged solely by the color of your skin and your gender - you can can guess what verdict is if you are white and male ( I can't tell your gender or race from your post, and I don't care, but that's all the student judiciary process may care about). I have had a student jurist tell me that the primary concern of the courts should be redressing the oppression of people of color by the patriarchal European overclass - and that it was reasonable and ethical to adjudicate cases basis solely on that basis!
The student judicial system would be laughable, if it didn't have so much power. They cannot imprison you. But they can get you expelled from the university (or advise the Chancellor to expel you). If that get on your transcript, good luck.
In general, it's hard to sue them, because you probably agreed to be bound by the student judiciary process as a condition of enrollment.
I think that you really,really do not want to get hauled up in front of a student kangaroo court on a weapons violation.
Mike