Hey There hope that you can get your barrels marked per the ATF Rules & regs.
I would advise that you find a person that has a Laser Engraver. That would give it a professional marking.
If you lived close to us, we would Laser Engrave it for you.
- The marking must be conspicuously engraved, cast, or stamped on the firearm frame, receiver, barrel, or slide.
- The font must be BLOCK letters, and stylized fonts or scripts are not allowed.
- The minimum height of the engraving must be at least 1/16 inch, with a depth of at least .003 inch.