Patriot:
By perform---I reckon you mean smoother operation?
For lighter hammer & trigger pulls? There are springs for those. Cheap mod, there.
Ejector rods can be tapered a might on the biz end. And them crescent knobs are supposed to fit.
Base pins need not be shortened. Those are long , enough I recollect. Can be polished for smooth spin.
Moving action parts & pins can be polished.
I cannot answer about a reverse spin pawl. But I'll wager it could be done.
My brother had an NR9 that was really slick.
But most of that came from Bulle Eye springs about a million rounds going through it.
Good luck, Patriot!
MG