I have a FN action with a 20.5" 358 Norma that has some barrel rust so needs to be refinished. Action would be fine. Has a set of Williams peep sights.

Need a guess as to value as a barreled action or action alone.

FN military type (still can be commercial) with thumb cut or FN commercial type with solid left wall?

Sorry. Commercial solid left wall. It is an "H" ring.

I'd say $350-$450.

I might be interested if it has steel hinged bottom metal.

What is the muzzle diameter of the barrel?

Nope the extended pin and slide off