The small one was my 2nd pneumatic launcher that I built and the big one was my 4th. The two guns kinda count as one because I never have both of them working at the same time. I always have the air valve and other stuff on one or the other, not both. Both guns are built almost the same, but one is just longer and more powerful. The barrel sticks out 5 inches from the tank on the small one. Both of them have good destructive power but not enough for me. My next gun that is almost complete is 12 1/2 feet long the tank is 10 feet by 4" and the barrel is 10 feet by 2"
