The main complaint with the Miroku produced for Browning BSS sidelock is that most were 26” tube guns. I almost fell down when I saw one that had been cut to 24”. Yes, there is at least one guy here who thinks that is OK, but, he hasn’t bought the gun, either, and likely will not.
I have a few guns that are 26”. Some longer, out to 28” and a couple 25”. I’m not buying a double with 24” tubes, and I bet most guys won’t.
George Caswell offered me a Purdey many years ago that had been built for a grouse hunter with 22” tubes, and slim and none chokes. He had all the paperwork to document that, as well. I suppose I would have got a grouse or two with it, and one day I would have been buried with it, too.

Best,
Ted