Taking that pin out is a Beaach!
The small screw is locktited in.
You have to grip on the needle nose with the grip of Thor
After removing the pin , I got the U:L together, but it wasn’t easy.
You have to tip the upper on a coward angle to the lower( kinda like putting them together backwards.
The front will not pivot, once the back pin is out.
So now for the weird stuff.
Riding the CH will allow the trigger to work.
Slamming the CH will not engage the trigger.
Trigger works with a mag when you release the bolt via the bolt release, but not when you release it manually.. (dummy rnds)
Then it’s opposite on an empty mag.
Also the maritime bolt catch is very stiff.
I think the trigger is causing all these issues and is a no go.