I cannot agree that doing something 400 times guarantees that the product will be good. It depends where your natural interests lie. If you are mechanically inclined, the mechanism can evolve to the point of perfection. If you do not have an artistic bent, the 400th gun may not look much better than the 3rd. It will probably be made better, but no guarantees.
Jeff, when A Martin is mentioned, you bring up someone who is an artist, he has the touch. Hershel does too. EK, and Pratt. I don't know Hershel, but I know Martin. He is being humble, and also he is being supportive and encouraging.
They might tell you that anyone can do it, but I beg to differ. If you think by mere repetition you'll get there, you are sorely mistaken. Something else has to happen. You must get in tune with your soul, let the materials and tools speak while 'in the mode' of building. A conversation, a collaboration between yourself, the idea, and the materials needs to happen before the object will have a life of its own. This can happen all by itself when you are simply working along, maybe on gun number 276. Don't think you have control over this. But sometimes everything comes together in just the right way. If that happens, consider yourself blessed. Then the next gun, nothing seems to work.
To me, the Holy Grail of all art, is to make a piece that has soul, the very object is vibrating with character, the hand of the artist can be seen, the maker's intent, THAT (in my 'umble opinion) is what makes a great gun, a great car, a great painting.
I'm just getting warmed up, so, come on, y'all. Bring it on.
Acer