Good job doing this and documenting it all with pics. I'm super happy with your adventure.
Like Mrs Frizzle on the Magic Schoobus sez, "discover, learn, and make mistakes."
Just don't forget that Popsicle stick fix when dealing with a USGI stock and a Norc receiver that has a flush fitting connector lock. That tend to drift out under magazine tension.
That's why we gotta do this Popsicle stick fix. It's in the FAQ stickies. I put them there ten years ago.
Cheers, Barney