I called myself a gunsmith and stamped barrels for nearly forty years; so did most of my contemporaries. If I lacked the ability to stamp in a straight line, I might have taken it to someone else. However, if I lacked the ability to stamp in a staight line, I would probably have lacked the ability to build the rifle in the first place.
Having said that, I still like the looks of the machine. I also admit to liking the look of cut numbers and letters. GD