Looks like something the numbnuts at RedJacket would have made "Nevah bin done befo!"
Looks like something Red Jacket would cook up.
I recall something about trigger devices are prohib? I can't remember. There was a crank device from the US that attaches to trigger guards that were or are illegal in Canada. I'm to lazy to search and relying on a faded memory.. I need some sleep.
The big question is would you shoot corrosive through it, cleaning one sks is fine but that thing looked like a royal pain in the arse to clean if shooting surplus ammo.