The American Gunsmithing Association publishes the American Gunsmith, the technical journal of firearms repair and maintenance.
related:
Footnotes / Sources:
American Gunsmith XXIV. Number 5 (May 2014): 1. Print.
I keep all of the back issues of American Gunsmith that I can get my hands on. If you have any 2010 or earlier copies you no longer want, I’ll gladly pay shipping.