How do you expect to sneak a AK-47 with a drum mag into a school? Stick it in your pants? "Yeah man, I got this major stiffy is all"
Take it to a "gun free zone" where there's nobody looking. Park your car right up next to the front doors, forget it, just drive through the front doors. Tuck it into your jeans, that stuff is possible. I mean, alternatively, you've got a high capacity magazine. Just blast your way in.
Can't imagine it'd be too hard, dude. Where there's a psychotic, suicidal will, there's definitely a way. I mean, what are they gonna tell you? "no sir you cannot come in with that loaded ak-47 please turn around :)"