"Katran" double barrel pneumatic speargun

Interesting variable power gun with maximum three dots, medium two dots and minimum one dot. Spring loaded side release lever for the shooting line and what appears to be a reverse sear lever with the pivot in a housing below the inner barrel. The nylon piston looks like it is of the hydraulic shock absorber type with the narrow diameter front section. Surprised to see it shot on land as it puts a load on the piston as no real braking when it slams into the muzzle. The skeletonized handle will be to reduce weight as I don’t recall seeing that on one of these guns before. Air release vale in the rear bulkhead above the power regulator controller and probably how the gun pumps up. Thanks for the video!

This second gun seems slightly different as the sear tooth appears to be a tilting ring that is straightened up when you pull the trigger which then lets the piston tail escape. If that is how it works then pulling the trigger will slightly push the piston rearwards against gun pressure, but only for a moment. In the video we can see how the throttle works with a shuttered rectangular window closing up as you twist the rear lever. The rear brass valve appears to be a rubber ring valve where the rubber tube blows off to let air in, and to let air out you unscrew it just enough to leak air is my guess. Shooting spears into a drum looks impressive, but the gun is not pushing any fluid out of the inner barrel and thus the gun seems more powerful than it will actually be in the water. Such shooting is dangerous as if the spear ricochets or glances off then it could go anywhere, so viewers should be advised to not try this at home. Most pneumatic guns can send a spear for very long distances when fired in the air and this is very dangerous as spears have been known to penetrate internal walls and car doors.