Paintball guns for sale are numerous and some of the designs can be compared with the gadgets in science fiction movies. Also known as paintball marker, paintball gun is an air gun used in the outdoor game of paintball. Major components included in a paintball gun are hopper, tank, and barrel. A range of paintball guns are now available according to the ability and budget of paintball players, and some of them are electronic, full-auto, pump, pistols, semi-auto, and stock guns.