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Have not seen one
I have not seen a barrel made of cast steel.
One issue with castings is air can be incorporated in a casting. A void in a barrel casting....
I work with X-ray equipment, and castings are routinely imaged in three dimensions for porosity. I sell that technology in another profession. The manufacturer makes more machines for inspection than they do for dental, same tech tho. Just lots more KV for inspection.
For critical strength parts like aircraft they image and inspect 100%.
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ricklin
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