well, here goes
I am one of the guys that took a correspondance course and am still in business after 8 years. I took the AGI course as well as worked for a smith and don't agree with all that has been said here. The AGI course is taught by Bob Dunlap who taught the Lassen college class for more than 20 years and he teaches the AGI course just like he was standing in front of the class at Lassen. Is it as good as going to a college, it all depends on you. If you are mechanically inclined and have access to most of the guns that are taught in the course, yes. If you are a wanna be and don't have the skills and can't take notes, then just like the college classes, you are in the wrong field and won't be successful.
Bob teaches using cutaway guns that he used for the College course and in fact, this course is college accredited for the State of California. It is as good as any course out there if you are able to learn and it is much cheaper than any of the colleges you will find.
Gunsmithing is very easy to get into, much harder to earn a living at. Take some business classes as well and if you have a good head on your shoulders and don't bite off more than you can chew on and you can succeed. Success in life means different things to different people. If you go into it only for the money aspect, you will have your heart broken very quickly. Like what was alluded to in the other posts, it costs money to tool up and if you buy all new machines and tools without earning some money first, you will most likely go belly up just like a lot of other smiths very quickly. Go slow and unless you have the money to spend, get by with your skills and farm out what you don't have the tools to handle. Most folks buy a barrel vises and receivers wrenches, a lathe, a mill, all the test guages and jigs that you will need to operate them, a belt grinder, bench grinders, a TIG Welding machine, a Foredom tool, a good vise, air compressor, sand blasting cabinet, a band saw and a good Miter saw and various assorted hand tools including screwdrivers and hammers and think they are ready to be a gunsmith. The only problem is all of this stuff costs more than most folks earn in their first two years of being in business and go belly up because of it.
I suggest if you want to be a smith, decide for yourself if investing $30,000 for a 2 yr school is going to be worth the cost. You will spend around the same amount for a shop and the tools and machines that I mentioned above if you buy them all at once. You can of course save money and buy when you can afford as well as buy good used equipment as well.
I started out with a foredom tool and a good air compressor and a good set of screwdrivers. I didn't buy a drill press for two years because the work I was taking in didn't require it. I built my shop up as my work load increased and I bought only the machines I needed for the work I was being asked to do. I didn't buy a lathe for 4 years and the first one I bought was a fine used Craftsmen lathe that I could turn out firing pins with as well as rebarrel revolvers with. As I went along, I built myself all of the barrel vises and reciever wrenches as well as most of the various jigs and other tools that I could. I built my own blasting cabinet as well as my drying box and amy humidity box. I saved enough money doing this that later on I bought a nice lathe and a mill without going to the bank to do so making it even harder to make enough to live on. It can be done and isn't as hard as it has been made out to be by some folks. The key is to take the work you have and do it to the best of your ability and that will make you a success if you have the skills to do the work.
I worked for a smith while taking the AGI course and I learned as much from the course as I did from the smith. If you are a fairly sharp guy as you seem to be, there is no reason why you can't do the same thing. The one thing that no one has spoken up about is the simple fact that your education as a gunsmith doesn't really begin until someone brings in their pride and joy to you to fix for them. I can honestly tell you that I learn something new every week. I and most every other smith in the business buy books and videos and talk to other smiths and continue to learn new things long after we open our doors. If you want to stay up to date, you will have to do the same thing. Things change every day and something new comes along that is way better than what we have been doing and you will have to be able to keep up with the times as they say. Doing a job taking an hour that takes every one else 30 minutes means you won't stay in business too long and part of this is learning new ways to do the same job old. The point is, no matter what the diploma says, it isn't worth spit if you can't do the work quickly and as good as the next guy can. It's always going to be the quality of the job and the cost of doing it that keeps business coming into the shop. If you have a diploma hanging on the wall and still can't turn over the jobs, you will fail just as quickly as the guy that didn't go to a trade school. A lot of the old smiths never went to a trade school until much later in life and most the schools they took then was a machining course to help them turn out the work faster and better. I'll let you decide which way to go on that, not everyone that earns money went to a trade school and not everyone that goes to a trade school earns money either. It always breaks down to whether or not you can do the job and keep your business running.
Can you do it, that's completely up to you. If you have the skill, knowledge and the patience and can do business without investing too much to begin with, yes, you can be successful. It's all up to you as far as that goes. With the internet and shipping being what it is today, even if you don't have a large business base where you are, you can still draw enough business in to make money. Just don't expect too much in the beginning. You have to grow a business just like you have to grow your skills.
I realize there are a lot of folks that won't agree with me on this, but it breaks down to one simple fact, a smart guy learns, it doesn't matter where the knowledge comes from as long as the knowledge is good. Check out the AGI course at this link:
http://www.americangunsmith.com/
If you can take the Master course as well as a couple of business classes with it I say you can be doing the job just as well as any one that graduates from any of the trade schools if you are a sharp guy. I have been in business for 8 years now and have not been hindered by my education one bit. In fact, with the library that I have from the course, there has never been one gun come into my shop that I couldn't take down and repair very quickly. The course is that in depth and you get to keep the DVD's as well.