AGAIN, THIS IS A NON FIRING TOY AND WILL REMAIN AS SUCH NO TRUNION, BARREL OR COMPLETE BOLT /FIRING PIN. IT IS MADE OF SOFT MILD STEEL, LITERALLY HARDWARE STORE PIPES AND TUBING. NO TEMPER OR HARDENING...

Just wanted to post a closeup of the relationship of the selector and trigger/sear/disconnect interplay.
Note in SA position the disconnect rear sear comes up to catch the bolt when trigger is depressed. Let go and the bolt loudly jumps to the main sear.

In A position both sears stays down as a selector cam lobe keeps them there.

I tried to make a very simple relationship and the assembly of upper and lower.
The only screws I have 2 for the flat trigger spring+guard and one screw that attaches the pistol grip+ trigger guard.
Those don,t need to come off.
Thanks for watching