I started with a pic rail folding stock but, didn't like the lack of adjustments in both height and length. Now, I can adjust the length and, have three height adjustments at the pic rail to buffer adapter. It's in the middle position in the pics however, I like the lowest position and moved it to the lower slot after shooting a little.
I started with a pic rail buffer adapter from A3 Tactical (I forget what weapon it was for) for a template then, machined to my liking and fit. I doubt it's up to some (including my own) standards but, I'm still working on refinements.