^^^??? I think I just learned something. I have never looked closely at how the number was created. I could tell it was hand written, and I always assumed with a vibrating marker like you can buy most anywhere. This marking is mechanical, like many small center punch marks close together. The metal is not heated beyond a minuscule amount due to deformation. It would be incredibly hard to measure the change in temperature. Gunswizard, are you saying an "electro-pencil" is a different process and heats the metal much more?
Last edited by GunDoc7; 06/18/17.
