A getting ready to build a krink pistol, which later if I move to a happy state (of residence, not of mind), I will register as a sbr and put on the stock. I am going for the side folding stock as it looks like the rivet holes for the side folder rear trunion and the pistol rear trunion are in the same location, so swapping later sould be easy. Questions: The side folder requires some sort of locking mechanism on the side of the receiver, does anyone have any blueprints to show location or build guide or pictures of how this goes? Second, since the front trunion is bought separate from the barrel, they were not at one time assembled and headspaced, so I would guess you are starting more at zero than with a different build - How do you initially guess how far to press in the barrel? Any other differences between a regular build and a krink? I have searched the forums and can't find these answers - Thanks!