I'm not familiar that much with gunsmithing. The Glock seems to be a very easy gun to maintain. The parts are rather cheap and it's easy to work on. I'm very technical and I was wondring if I could do gun smithing as a side job. Are there levels of gunsmithing? Is there demand? I can see that some people would like to have sights replaced and take the gun the a gunsmith because they have not done it before or don't have the tool. So assuming replacing the sights is an easy job, what would be a very hard job? I'm not talking about manufacturing a barrel or anything like that. maybe a compleate rebuild of a gun?