If you want someone local to the San Antonio area. M&M Laser Engraving does awesome work and is very reasonable with the prices. The owner's name is Jim and he has done multiple Glocks for me over the years. Highly reccomended. www.MnMLaserEngraving.com
My $ are on Photoshop. That would not be something I would have on my gun. A personal injury attorney would have a field day with that if you ever had to use it. Just like the "notches" in the grips. Really bad idea.