I have 2 barrels chambered with a bore bar and two guns chambered with a reamer. May be coincidence but i am leaning toward the bore bar. What are your thoughts?
They can do some trick stuff to minimize the tooling marks in CNC, but they're not gone. A lot of the scratches you see from a reamer are because of chips. You can make a chamber look very pretty with a reamer doing more flutes and full coolant flush.
At the end of the day the attention to detail and getting things centered up and the right size matters most.