Never seen anyone offering this here before so I figured I'd give it a go. I can do jeweling on stainless steel or titanium barrels, automag valves, etc. Really catches the light and gives it a nice sort of holographic effect. I do not recommend it for aluminum or moving parts, it is only a surface finish and the pattern will wear away too quickly with soft metals.
Prices starting around $15 + return shipping for barrel backs and the like, contact me for a more accurate quote. Post and PM if there are any questions, thanks.