Spanish mausers of the M43 and m44 variant aren't discussed a whole lot.
There are myths of the steel being weak, but never seen evidence of it.
I have the M43. The m43 you can see the refurb as the bolt locking lug edges are buffed to death. Works well, and is slick as butter, but refurbed.
Some have unused german ww2 armourer parts on them.
They sit at gunshows around here for $350.
They seem well built though. Mine is heavy and feels solid as hell.