I had been looking for a butt plate to fit an old Berreta shotgun. I found plenty of butt plates that people would say fit my model but when I asked for measurements none fit exact. I finally found one that came really close but not exact. That got me wondering. How did gun makers of years past and today fit butt plates? Did they fit the stock to the plate or the plate to the stock? I'm talking mass production not just one at a time. If you look at a gun with the original but plate, it's usually a perfect fit. This may seem a odd or stupid question but I got it stuck in my head would like to know.