anodizing may affect the tolerances of the marker. especially for it being a macdev and having tight tolerances in the parts and would require FULL disassembly of the gun and will be more expensive. it would look very nice tho
laser engraving is cheaper, won't affect part tolerance, and would maybe require you to take apart the grips and a few other things. will be alot cheaper but may or may not look rediculous. if you laser it give it a calm, unique pattern and don't have them overdo it.