AGA or AGI?
Both are somewhat associated together. For $35 a year, you get a magazine that I have found to be informative. They offer courses at a decent price.
But, if you are interested in becoming a gunsmith, I suggest attending a school.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC