Hello guys.
This is folding hinge by XLR industries. Price is $115. It is very similar to HERA SFU, only guys at XLR went smarter. They put two set screws which will be use to adjust any play in hinge in closed position. Very easy to adjust. Another reason use XLR-quality of parts is top notch, so their support. Shipping super fast, communication-they reply instantly. Very good supplyer.
I am still debating myself if I want to keep folding this side. The reason for it is-now I need wider bag, I have folded stock adding thickness one one side and windage turret from scope on another side. My thinking is, if I put folding to action side, then I will cover both thicknesses. Not yet to make final decision.
As far as folding mechanism-it looks very solid built.
I will post picture later.

Sorry for my English, it is my second language and I try hard LOL