Leland, Much appreciated for the info. One of those things one would never think of doing when getting what should be a definitive answer from an official is to get him to write it down for the next guy who tells you something different. I’m sure more than a few people besides myself will benefit from such advice. BBI just had this conversation with the ATF agent in my area. If you buy a gun and engrave it to sell you must have manufacture license and the gun has to be marked as required. If a customer brings you a gun to engrave a 01 license is all you need. I have a 07 because I was told by an ATF agent engraving was manufacturing. That being said in the years I have had a license if you ask the same question to 2 agents you will 2 different answers. I was told by an agent to get answers in writing and have them sign it. Engraving your own gun not for resale should not be a problem.
We have an agent here telling people who cerakote that is manufacturing the same agent who told me engraving was manufacturing 15 years ago.
Good luck.