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Improved automatic shotgun, which being of the type that have a tubular magazine arranged parallel below the barrel, is essentially characterized, because the loader is wrapped, approximately in its middle area, by a cap, so that its rear end forms a a chamber communicated by an orifice, arranged superiorly, with the barrel by means of another coinciding orifice and made in said barrel, and in which chamber a piston and a retainer, slidingly and freely mounted on the magazine, are capable of being inserted and the end of a hollow cylinder, also slidable on the magazine, and articulated at its other end to the previous ones of the two positioning rods of the bolt, the other ends of which are hinged to another pair of connecting rods, connected in turn to the actuating spring arranged in the inside of the stock. (Machine-translation by Google Translate, not legally binding)
A harpoon rod tail with elastic retention for all kinds of spear guns spearfish spearfishing (Machine-translation by Google Translate, not legally binding)