Stan,
These shotguns have a lot of eyeball engineering. Nothing wrong with that if the eyeballs are good.

I bent the barrels on a pricey gun a couple months ago based on eyeball engineering, to correct a high POI. Actually, I more "straightened" them than "bent" them. They had a slight bow upward, and I took it out. It's that Italian 410 I'm refinishing. I didn't want to sink any cosmetic work into it until I got it to shoot where I pointed it. It's all better now, but I'm sure there are guys here that would have a heart attack if they saw what I did.