Every time you bring up one of these "I've got one of these" or "There are muskets from the Mayflower that still work"...it just re-enforces how rare a species these things are.
You sound more and more defeated every day. It's because you are.
They are rare because they were replaced with better technology, so people took the old guns and melted them down. Also, they are rare because there really were not that many of them in the first place. At the height of it's power the British Empire probably had less than 1 million muskets, there are well over 200 million guns in private hands in the US, and millions more in the hands of the government. Given that there are still hundreds, if not thousands, of muskets left 200 years after they were obsolete, how long do you think it will take before all the guns in existence will disappear if we simply stop making them? 1000 years? 5000?
Well, for one thing, The "all guns in existence" is nowhere near what I was stating would happen. The goal is to make the weapons that are now cheap and readily available harder to get. Fortunately or unfortunately in our capitalist society (depending on where you are in this debate), availability goes hand in glove with money. Further allowing (or exacerbating depending on your viewpoint) for 2013 America, the government consistently favors/retards growth by taxation in one form or another. The courts have held that this is legal. It is the only pathway to take toward making the "cheap and readily available" harder to come by.
Another alternative would be to place more emphasis on physical examinations by medical professionals and have the results decide on whether you "qualify". I, for one, don't want to go there really except in the cases to where the fitness of the individual has already been determined or there is other reason to suspect the intent of the firearms purchaser. Again, I'm hesitant to make a Rorschach test a hurdle toward being able to maintain your rights or have them taken from you....what's next...one for journalists...bloggers?
Anyway, if you stem the demand through raising prices, the manufacturing dries up. Once it dries up, you begin to experience scarcity. As said, it will take decades but there will be an effect sooner or later.
I'm open to other ideas but interdiction based on a shrink's opinion and making that mandatory seems to be extreme to me.