Nail removing gun - GIF

[PDXsparky]

I’d like to know how that was made.

[Frank S]

I’d like to know how that was made.

Fromthe looks of it the thing is nothing more than a standard nail gun without the feed and with a slightly different shaped nose and striker that allows the tool to be placed over the protruding nail point.
Pretty useless tool for most things, actually as you still would need to first remove the board with a pry bar then make sure the nails were straight enough for the nose to slip over the nail.
Might work fine for #6 to #8 finishing nails in trim boards but I would imagine you would need 2 or 3 different sized noses for larger nails if it would even have the power to drive framing sized nails out of 2x4's
Plus there is the fact that each nail shot out of the lumber becomes potentially lethal or at the very least injurious projectiles