Those are nice! Nice heal stamp poly. Is that a early SAGE that the SAI is in?
It's a Marstar AKM stock from Canada, don't know how it got here, but my buddy got a hold of 3 of them. I got a good deal on it. It is pretty much just like a Sage. It is an aluminum block and comes with an oprod guide, and you bolt the action to the stock via the oprod guide, thereby free floating the barreled action.