For one of my classes i need to make a movie on campus. It is going to be an Extreme low-budget film, so needless to say, i cannot get blank-firing guns. I did get permission to bring in Airsoft guns, but there are two rules i have to follow 1- You must get permission from the teacher and the teacher has to notify administration beforehand 2- The guns cannot be capable of firing any projectile The first rule is no problem for me, but the latter has been giving me some problems. At first i was thinking about removing the entire spring firing assembly from the spring guns i will be using, but after taking one apart and never being able to put it back together again, i found this was ineffective. i was also thinking of plugging the barrel with Hot Glue, but due to the low quality of the guns, they would most likely melt. any other suggestions? Bonus points to whoever can tell me an effective way of covering up the orange on the barrel tip. Sharpies dont work well and wear down quickly, and spray paint is too much of a hassle. P.S - This case is special when it comes to taking things like airsoft guns to a school. please don't get the idea that its alright to do this under any circumstances. The gun must not be able to expel a projectile. being able to do so would clasify it as a wepon, and likely causes of that could result in arrest. just because a gun dosent have ammo, dosent mean its not a gun.