Yes, there is a drastic difference in thicknesses between 1 and 2 frame guns in 12g. Or for any guage in that matter. Usually the thicknesses in the front half of the tubes will be comparable. But it is the back half where there is quite a change. A smaller frame size will ramp up more gradually, and a larger will get a lot thicker much quicker as you move towards the breech.
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B. Dudley
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