Chrome plated bores, this does extend the life of the gun dramatically. Actions are great survivors but barrels do seem to run out of usable life very quickly if neglected compared to actions. Do Brit gun makers want this or do they want to re barrel a gun in the future??
Interesting question. Can't say I've ever seen an Ithaca SKB with pitted bores. On the other hand, can't recall ever having seen a Webley & Scott 700 with pitted bores either . . . and thousands of those were made before plastic wads appeared. Would be interesting to read comments from gunsmiths, who've likely looked down a lot more bores than most of us, on the subject.