I have a buddy who rebarrels and does minor gunsmith jobs. He recently got an FFL and started a business under an LLC. On custom guns like GAP, KMW, APA etc., how do they "etch" name and logo on their bbls? What would the equipment cost to do this? What is the easiest way that doesn't look botchy to stamp the cal, and neck dimensions on bbl? Reg "dog tag" letter stamps look awful cheap on a custom bbled rifle. Thank You! krw