Gentlemen,
This folding stock M1 was tested by Ordnance for use in the field by different units. The main problem as some of you have stated was that the folding stock was not strong for combat op's. I only know of one built and it is at SA. During testing we drop the bomb and the war was over.
I hope you had fun with this one.
Thanks again
Clancy
ps that's not a drawing but a photo of the one made.