Last year I retired my 1957 built (and bought new) 740 Remington because I "wanted" a new moose rifle.
It was factory blued and most of it is still there despite my "less than even minimal" care and cleaning. It also still has it's original factory "wood" stock - albeit with a few nicks, scrapes and scratches - never "refinished", and while the original top coat is worn, the wood is still sound.
This rifle was hunted pretty much every year, in Northern Ontario, in the cold, snow, rain, sun, humidity etc.
The point of my story - synthetic stocks, Cerakote, stainless steel, etc etc, seems to have solved a problem that didn't exist. The "average gun" used by the "average hunter" even in extreme conditions with minimal care will outlive the owner.
I would use the 350 bucks for extra ammo...