jaguar piccolo technisub speargun

The Jaguar gun uses compressed air, not carbon dioxide. You need the correct hand pump to pressurise it. Like most pneumatic guns the hand pump screws in the back end of the gun, where the black plastic tail cone is which screws off.

how i can open the gun ant see what part is missing?

What makes you think some part is missing? On these mid-handle plastic grip pneumatic spearguns with a rear tank the barrel is permanently affixed to the centre section as the upper part of the handle was moulded in place around the barrel tube. So you unscrew the muzzle to get at the piston and unscrew the metal rear bulkhead to remove the rear tank and access the sear lever and pull rod for the trigger. Unless you really need to open the gun up I don't recommend it as spare parts are not readily available and the gun has been out of production for decades. A later "Nuovo Jaguar" is much the same gun but with a yellow and black colour scheme and a bigger muzzle shroud with a more sculpted appearance, but even that version was produced a long time ago.

An exploded parts diagram for the gun should be available somewhere, do a web search as US Divers certainly had a series of diagrams for all their guns including US manufactured (band) as well as the Italian Technisub pneumatic spearguns.

I got one piccolo speargun but i don't know how to fill it up with air. Can you help me?

MsgJack said:

I got one piccolo speargun but i don't know how to fill it up with air. Can you help me?

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You will need a Technisub hand pump, however hand pumps from the later Technisub model guns may fit it. Companies tend to use the same size connector for all their guns. Look on eBay and you may find one, the Jaguar pumps are anodized a gold color and have no breather holes in the pump body. The pump "breathes" on the suction stroke as it draws air in from the surroundings through the rear pump rod hole in the pump.

The thread on the hand pump is 17 mm OD and the thread pitch is 1.5 mm between thread peaks, so I assume that is M17x1.5. Unlike other hand pumps the pump's connection end has a smooth shoulder section without threads that pushes inside the "O" ring in the rear charging port of the gun as the pump thread behind it is tightened up. A hole in the flat front face of the pump that then directly abuts the bottom of the gun port allows the relatively fat valve stem on the Technisub gun to poke through it, this hole being slightly larger than the valve stem, but much smaller than the diameter of the pump's body tube. So the Technisub pumps look quite different to the usual open-ended pumps with a big hole in the attachment end because of that sealing "O" ring in the rear of the Technisub gun. On the "Jaguar" guns the valve stem is part of a pressure gauge with the gauge markings molded in rings on the rear plastic tail cone with the stem being viewed through a slot in the side of the tail cone to read off the pressure. Later Technisub guns ditched the pressure gauge, but kept the thick valve stem. Whether the last Technisub rear handle guns used this pump arrangement I don't know, but you have a "Jaguar" which does, albeit the "Cub" or "Piccolo".