When I was in high school I was in a Senior Class play where in one scene someone threatens another person with a gun (I was the one being threatened). Now we didn't have a prop-gun and while we could have gone out and bought a toy gun, back in those days (the 60's) most toy guns were chrome-plated six-guns for kids. We wanted something more realistic and this was before you could buy a pellet gun or something like that that actually looked like a real pistol. Our Solution? I borrowed a Walther PPK that my girl friend's (now my wife) father (was was also a deputy sheriff) had taken off a dead German SS officer during the war. It came complete with a holster and two magazines, but no ammo. The holster and magazine allowed for a very realistic scene where the guy with the gun was seen taking it out of it's black leather holster, remove the magazine, as if he were checking to make sure it was loaded, putting the magazine back in the pistol and the racking the action as if he were chambering a round, something that we could not have done using some dime-store kid's toy pistol. And NO one, not the school's administrators, nor any of the teachers, nor any parents or anyone who attended the three performances of the play, said anything about having an actual pistol in school and of course, during the course of the play, it was pointed at least one person, ME.
Also, when I went off to College the following year, I was able to take my own personal rifle and shotgun with me as they were allowed in the dorm. Granted, we had to rent a gun locker from the school which was in basement of the dorm and we had to keep our guns and ammo in that locker at all times. If we needed to clean or repair one of our guns, we had to do so in this 'gun room' (it had a work bench). You could only take your guns out of the 'gun room' if you were going hunting or for target practice. Note that the university also had it's own indoor target range located in the basement of the school's library. There was also a makeshift 'skeet range' that some students had set up years before on some state land next to a ship canal which was a safe place to shoot clay targets.
Also, the ARMY ROTC unit had a set of 1903 Springfield rifles which were fully functional and while they were kept locked-up, they were there because the ROTC unit was often asked to provide both honor guards and firing squads for funerals of war veterans.
Granted, this was back in the 'good old days' (the 60's) which was a very different era than today.