Short answer: A fiber laser black-marks stainless steel by heating the surface just enough to grow a dark oxide layer under it (annealing), so the part stays smooth and no metal is removed. Brass turns dark when the laser changes its surface at high power with a very tight line spacing. Our Edge 50W preset for black on stainless runs at 30% power, 102 mm/s (4 in/s), 60 kHz with a 0.025 mm line interval on the 220mm lens. Because a black mark has essentially no depth, it is a cosmetic or ID mark, not a substitute for the .003" deep engraving ATF requires for serial numbers and other required markings.

Short answer: To laser engrave a barrel or suppressor tube, mount it on a rotary axis (a chuck for short, rigid parts like tubes; rollers for long barrels), measure the diameter at the engraving spot with calipers, enter it in LightBurn's rotary setup, and engrave the design in narrow slices so every slice stays in focus on the curve. A Q-switched fiber laser like the Edge Series works well here because Q-switched sources showed a longer focal range than MOPA in our testing, which gives you more room on curved surfaces. On a suppressor, the outer tube is the serialized "frame or receiver," so required markings still have to meet ATF's .003" depth and 1/16" serial height rules. Our Edge 50W anodized aluminum preset (60% power, 3,048 mm/s, 25 kHz, 220mm lens) is the starting point for both flat and rotary aluminum marks.

Short answer: Most US shops that publish firearm laser engraving prices charge roughly $55 to $85 for an ATF/NFA marking (name, city, state, serial), $95 to $225 for a logo or text on a receiver or slide, about $15 per side for PMags, and $500 or more for full custom artwork. Prices vary by region, part, and how much design work is involved. Set your price from three things: a minimum ticket, machine and setup time, and design time billed separately. In our shop, an Edge 30W reaches ATF's .003" depth on a 1/16"-tall serial number in steel in 20 passes, about 2 minutes, so on compliance work most of your billable time is setup and fixturing, not the laser running.

Short answer: A gun shop laser engraving station needs four things: a dedicated, sturdy bench away from customer traffic, a controlled work area for a Class 4 laser with 1064 nm-rated eye protection, a fume extractor that filters both particulate and gases, and a written workflow that ties every engraving job to your FFL records. Most shops fit a desktop fiber laser, a fume extractor, a parts cart, and a fixture shelf into a corner of the gunsmithing area. The workflow matters as much as the hardware: in our shop, an Edge 30W reaches ATF .003" depth on a 1/16"-tall serial number in steel in 20 passes, about 2 minutes, so the machine is rarely the bottleneck. Intake, logging, setup, and quality checks are.

Marking polymer frames and metal slides from the same bench changes how a firearm shop operates. You stop splitting jobs across two vendors and start controlling the finish, the turnaround, and the margin on every piece that leaves your workbench.

Short answer: For guns, a fiber laser is the only one of the three that engraves bare and finished metal directly, which is what serial numbers, receivers, slides, and barrels require. CO2 lasers are excellent on wood, leather, acrylic, and many non-metal materials, so they fit stocks, grips, and cases, but their beam reflects off bare metal. Diode lasers can mark anodized aluminum and wood, but they cannot engrave into steel. In our shop, an Edge 30W fiber laser reaches the ATF's .003" depth on a 1/16"-tall serial number in steel in 20 passes, about 2 minutes, something neither a CO2 nor a diode laser can do without a fiber source.

Short answer: A pawn shop with an FFL can use a fiber laser to add custom engraving to firearm trade-ins, offer engraving as a paid service on customer-owned guns, and personalize non-firearm inventory like knives, tools, and stainless drinkware. ATF has said in Ruling 2009-1 that cosmetic engraving is not manufacturing, so engraving work generally fits under a dealer or pawnbroker license, but you must never alter, cover, or remove an existing serial number or required marking. A Q-switched fiber laser handles anodized aluminum, steel, stainless, and most gun polymers. In our shop, our Edge 50W preset marks anodized aluminum at 3,048 mm/s (120 in/s), which is fast enough that a simple logo on an AR-15 lower takes very little bench time.

Short answer: Engrave required markings and any deep engraving on bare metal before Cerakote, and laser decorative logos and contrast work after the coating has fully cured. ATF measures the .003" minimum depth from the flat surface of the metal, so serial numbers belong in the metal itself, not in the coating. Cerakote H-Series goes on around 1 to 2 mils thick, which can partly fill a shallow engraving, so many shops engrave first, coat, then run a light laser pass to clear coating back out of the characters. In our shop, an Edge 30W reaches .003" depth on a 1/16"-tall serial number in steel in 20 passes, about 2 minutes, so engraving before coating adds very little time to a job.

Short answer: Most gun shops are best served by a 50W fiber laser. A 30W handles everything a gun shop marks, including ATF-depth serial numbers: in our shop, an Edge 30W reaches .003" on a 1/16"-tall serial in steel in 20 passes, about 2 minutes. What wattage changes is how fast you get to depth, not which materials you can mark. Pick 30W for occasional serial and cosmetic work, 50W for daily serials and mixed production, and 100W for high-volume deep engraving.

Short answer: To laser engrave an AR-15 lower, lock the receiver in a repeatable fixture, set focus on the flat of the magwell, and run two kinds of jobs: a fast one-pass mark for logos and cosmetic text, and a slower, repeated deep-engrave recipe for anything that must meet ATF's .003" depth rule. A fiber laser is the right tool, because it removes the anodized layer cleanly and can cut into the aluminum underneath. On our Edge 50W with the 220mm lens, the anodized mark preset runs at 60% power and 3,048 mm/s (120 in/s), while the deep "Cut" layer slows to 356 mm/s (14 in/s) at the same power. In our shop, the Edge 50W reaches ATF .003" depth on anodized aluminum in 15 passes. Measure depth on a test spot before you mark a customer's receiver.