MGB-20 Golf Ball Cannon model. It comes with a pneumatic trigger ignition system. It has a detachable barrel measuring 36" x 2.0". This easy to handle Golf Ball Cannon can shoot well over 200 yards on every shot with compressed air as the fuel. It accepts the full line of M Series interchangeable barrels. See the barrel section for more choices. No special tools or parts are needed. The cost of the MGB-20 Golf Ball Cannon blueprints are: $20.00