A long mailing tube and a soft rubber ball that will fit loosely inside of it can be used as an interesting gun for in-door target practice. A deep notch is cut in one side of the tube near the end. In use, drop the ball into the tube so that it may be held in place with the thumb, bring the tube to a vertical position and then strike forward with it so that the tube comes to a horizontal position as quickly as possible. At about the angle indicated in the arc of swing, raise the thumb and the ball will fly out of the tube at high speed. Accuracy of firing is a matter of practice, of course, but it can be developed to a surprising degree.