bruh44
Does the supersafety work without the upper on the lower, where you actuate everything by hand?
I was considering doing a write up with pictures included showcasing the process of troubleshooting and getting metal super safeties working, I assume that is what you're talking about a Metal Super Safety that you bought?
First I would address the binding of the top of the lever with the bolt carrier group, I had to file down every single metal lever I purchased to prevent binding, so I would file a little bit off and refit it, charge it, and repeat until the binding is gone. Let me know if you need a picture showing the surface I am referring to.
The same thought process should be taken when rounding the trigger, make small cuts and test in between to find what works, by moving the super safety lever by hand without the upper attached.