RvanN, Casting's are done for the econmitices, much cheaper than machine. At its best the quality is not their in the casting compared to maching. Although a good casting is generally sufficient for the purpose.
We all do make mistakes or over look things. I would be ashamed to have a barrel like the one in the picture with my name attached as the manufacture.
If you shoot this barrel for distance your going to hit into the next county, ether the county on your lift or the one, on your right.