Don't know enough about barrel making to make an educated statement, but maybe there is a tolerance range that is acceptable. Maybe my measurement was a little off and closer to 1/8 or even the other way. ( I will try and remeasure later)So the question is, how are these barrels out of spec? BM claims 1/9, one guy 1/8, and another 1/8.5, I would be worried what they used to make these barrels.
Agreed. If people looked up how cold hammer forged barrels are made, they'll see why. From what I understand, the barrel's rifling is shaped into the bore around the rifling form by the hammering action of the CHFing process, not by running a rifling tool down it.I would say it would be pretty hard to have a mass produced chf barrel to be out of spec.