Someone asked for instuctions awhile ago (sorry cant remember who) how to build an m4 stock.
This one should be better than the one on my Dieamco c7a2. I havent tried it yet.
About this creation
how the actio bar or arm should be placed
again how it needs to be spaced there might have to be spacers or something put into it. If that doesnt work use a 3mm axle instead of a 4mm and use the round 1x1 (the short ones) and plug the holes on the outside that should work.
If the previous doesnt work then there is the old way I did it with the red being a spring. It likes to come apart easier with that than it should with the new one.
the red circles are showing were to put the elastic I dont know what kinds will work.
If it doesnt work comment below and i'll try to fix it.