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Lots of bad information here.
There are several kinds of lasers. Some will not engrave steel. There are some that will literally cut a gun in half!
Generally, fiber lasers are used to engrave steel. They can cut deep into the metal. Diode lasers can cut steel, but it takes quite a few passes. CO2 lasers will not cut steel.
Simple lettering can be done with a diamond drag pantograph engraver.
I am a hand engraver, but I have several pantograph machines and a diode laser (that I have never used!
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