That’s the science. The religion-and-wizardry part comes into Enjoy mainly because there’s no definitive way to test the precision of a brand new barrel with and without having split-in. Chilly-hammer-cast barrels will not be cut, but hammered close to a mandrel to develop the rifling. They should be smooth. Ditto https://telc70123.blogvivi.com/36687611/little-known-facts-about-telc考试报名