Good grief! I have no idea what the action is, but it does look a bit of a mouthful, and it looks as if it could be pinchy. I looks like some part of the design stage for a French link! I hope someone knows, I am curious too now.
Ive ridden in one of them, its called something like a double mouthed jointed snaffle if i remember. All i know is it is very strong and serve and shouldn't be used in the same as a normal snaffle. I think it works the same as a normal snaffle just in a harsher way. Hope you find out more informaiton
This bit is also known as a scissor bit.
As mentioned it crushes the toungue like a pair of scissors.
It certainly does not work like a normal double snaffle does due to having different length s on the mouthpiece.
This bit unfortunatly is made twisted which as you can imagine is horrific.
It is used in polo a lot as a gag (help).........................