The problem is that none of them are any good. You might learn some "armorer" (ie: parts changing) skills, but there's no good programs online to teach you how to be a gunsmith. The best way is to apprentice with a master, or take it at a college... there are a few good ones:
I am taking the DLI Modern Gun School through mail correspondence. I just started it (actually on the first lesson) and it seems to be pretty good so far. There is a basic and an advanced class. The basic is around $999 and is 31 lessons and the advanced is $1399 and is 59 lessons. Seems like it covers all of the basics; from fixing guns to business plans. The lessons will be sent out to me over the next 3 years unless I call for them earlier. You may want to check it out.
Signed up for the AGI's master course a few years back. I'm about half way through it. Been working at my own pace. I've learned tons from it. Good part is if I get stumped on something, I can always go back and pop in the DVD.
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