So the tbargun or tbar speargun has a dedicated French name now, it’s the barrebalète! It was chosen by the member of the chassesousmarine.com forum.
In this video, you see a weighted down verson of the tbargun. I put one kilogram of led in the stock. It makes is perfectly neutral and helps reduce the recoil from the 3 kg metal bar!
Here I shoot a small edible shark. You can see how it simply obliterates it. It’s not a gun you’d call practical but it sure does kill whatever you put in front of it!