For the forward 2/3 of the barrels .025" has been suggested as a minimum thickness for safety reasons. The rear 1/3 of the barrels where maximum pressures are exerted requires thicker wall thickness and the wall thickness at the juncture of the chambers and the forcing cone is the most critical as far as wall thickness goes. I'm not certain of this but I think .090" at this location would be about minimum. Others may disagree...
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