You can't "engrave" metal with a low power (>400w?) C02 laser. You can only "mark" metal. For actually removing material, which is legally necessary for engraving firearms per ATF rules, you'll need a fiber or yag laser (as was already explained), or good old fashioned cutter tools... And if your intent is to make anything above 'hobby' money, plan on buying 2 machines. Second machine can be another like the first, or totally different, like a laser plus a CNC tool engraver. This comes to mind because of a few recent calls- I've had 3 people ask me about laser engraving so far this month, one is a customer, the other two were cold calls, but all 3 of them have broken down fiber lasers and are in a quandary as to how they're going to get their work done! I'd love to help them, but only one- my customer- has work I can replicate with my IS. The other 2 guys I had no answers for...I will say this much about the four C02 lasers I own: As much use to me as they are, and as much money as they make me, they have a multitude of limitations. This is usually found out the hard way 'after the sale' in the form of materials not behaving as you'd expect. I love my lasers, but I have twice as many CNC tool machines for a reason: I need them. While fiber lasers are the bomb, I'll probably get by until I retire with my trusty carbide cutters...
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