Is it really that difficult to wipe over the rifle with an oily rag? The guys with blued rifles do it all the time. Stainless rifles will rust less but still get the odd spot if nothing is done or worse even if any protective layer gets cleaned off all the time. Some old stainless rifles we get in do not have one spec of rust even though hunted very hard and then quite new rifles come in very rusty... especially the underside which is not visible. Everyone can choose how they treat their gear. You can choose rust or no rust. If a rifle is capable of rust spots within two weeks with lack of care... how many rimes will one be able to send a rifle back to the manufacturer before they pull the plug?
Some believe that a rifle will not shoot if there is moisture or oil between action and bedding and therefore degrease the action before dropping into the stock and of course one get the results after a while.
Even Pica rail just screwed on might produce rust inside the gap, epoxy bedding , good layer of Loctite can reduce or eliminate the chance of rust in that area.
Even the dreaded WD40 sprayed in the action area of the stock and underside of the action before assembly helps prevent corrosion. Wipe off what is too much. After a rain outing I flush my rifles down with WD40 and wipe off the excess. No accuracy or rust issues.
edi