We have a fiber laser that will engrave a lower, or pretty much any metal, to the depth specified by the ATF for NFA items.
We can engrave just about any metal you might have. Knife blades, stainless steel plaques, etc. Look at the sample photos for some of the work we have done for customers.
We'd love to have the opportunity to discuss how we can help. Trust identification or customization of your favorite knife, we are here to help.