Yes, sorry, I didn't understand how the parts interacted. I figured it out, and it's almost completely done! All I'm left is the butt assembly. I do have another issue though.
I have tried reinstalling the bolt carrier spring-loaded post, but it is impossible. The post looks 2 times longer then the one pictured in Ian's book. Turns out is a Mk2-style post, but I don't think it would work on a Mk1 carrier. Am I correct?
The buttstock spring assembly looks daunting. If I understood correctly, there are 2 recoil springs, a buttstock cap spring and a receiver buffer spring. Is the thicker spring for the receiver or the buttcap? Also, how do I install the receiver buffer spring?