I used a Personalizer Plus chemical etcher with a stencil I made to mark the barrel. I was suggested this unit by two other Smith’s and so far it seems to work well. I have only had it for a little over a week. On the subject of rifle building Bob Pastor is the man who taught me how to Chamber & Thread a rifle barrel. If you look at Bob’s shooting accomplishments and the Viper rests he builds Bob knows how to build a custom rifle and is a Top Machinist in my book.