I know everyone has already said "don't do it" a million and a half times, but it needs to be said that many times. People have said "if it's with a science or art project, it'll be fine, probably". Maryland (where I live) is relatively moderate with their Zero-Tolerance Policy, but they will still catch you for anything and everything. I accidentally had a knife in my pocket once. I am a very good student, got the highest grade in my class on the PSAT and a very high grade on the SAT (and I will be taking it again). People know me. My school is relatively small and in a relatively low crime area. Everyone knows that I wouldn't hurt anyone. But I had a knife. It is amazing how irrational people can get when faced with a crisis or what they think is a crisis. All I had a was a smallish knife and I got suspended for 10 days (the maximum), an expulsion conference, a felony charge and arrest and 25 days in IAEC (Interim Alternative Education Center, a euphemism for the mandated student wastebins with No Child Left Behind). The court decided I wasn't worth prosecuting and let me go with 90 days probation, I never ended up serving all of my 25 days (only 2) in IAEC because of an unfortunate car accident, but I still had the humiliation of being escorted out of school in handcuffs, crippling 10 days unsupported (i.e., they don't give me any of my work) suspension, and lots of bullcrap with the court and school system. And now they think that I am going to shoot up the school.
I know you're not going to do anything, but you asked what would happen, and that is what would happen. Or worse. I know any component of a firearm is an instant 10 days suspension and expulsion conference, no arguing.