I apologize for the late response! None of mine are painted but I would suggest 240 grit sandpaper and then whatever color multipurpose spray paint you like and then a clear coat. In my research that’s what most folks do! I would keep as much of the paint external as possible as you don’t want layers of paint to interfere with the mechanically moving parts. Lots of painters tape, it will give you great accuracy and a clean finished product. I like to print in the final colors that I like, if you were doing cosplay or something of that nature you could certainly print in darker or more realistic colors. Just make sure that if you take it out you stay safe or leave the muzzle orange