Contender, that rough surface also traps and retains oil! With reasonable maintenance, I see little if any difference in corrosion resistance.
Both the matte blue bbl on Frankenstein and the highly polished one on my oldest have seen plenty of salt marshes, goose blinds and bad weather. Neither has any rust.
While the Expresses come with one choke tube vs the WM's 3, the tubes are both widely available and inexpensive. I've seen them as low as $10 in 12 ga,$8 in 20.
I believe I'll start a thread on Remington bbls, I've seen some confusion about them lately.
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