Our grampa made us slingshot rifles we used to shoot berries and rocks with. It consisted of a piece of broom handle with a copper barrel attached on top of it, which had an iron rod inside attached to inner tubes at the back. You pulled back the rod and let it go when you wanted to shoot whatever was in the barrel. Ah the memories... Grampa also made us our first slingshots... Which we immediately used to shoot other kids with off-course Grampa would be proud seeing what I have being building these days...