This is just an aside but I think at one time there were some nice O/U's coming out of Spain, Laurona has always been my favorite. The fact that many of them have double-single triggers is a big part of that. I just recently got this 12/20 gauge 2 barrel set. The 20 gauge barrels weigh the same as the 12 gauge barrels even though they do not have ribs on the sides due to the larger spacing.
Why did the O/U's "go away?"
CHAZ