i think the paintball gun is to small. i do believe that compression is the way to go. i will see if i can come up with a concept or two that might work. another way is gunpowder. i know it sounds bad, but i dont think it will be and it will be cheap. get a metal pipe that has threads at on end that is big enough to hold your mouse. seal the end with the treads with a cap. drill hole through cap just big enough for fuze. add a half a themble full of black powder then get a piece of foam and compress it and stuff it down the barrel. then place mouse and light fuze. get back.
