See, things like this are what I think of every time I hear the same old "That's the free market at work!" defense for profiteering. Our economic system does not work with everyone charging anything they want, as such arguments seem to assume. Put it this way: Would anyone be defending a grocery store that decided to charge $50/lb. for hamburger? How about if all the grocery stores in town got together and agreed to raise all prices by 20%? How about if a hurricane was going to hit your house, and Home Depot raised the price on lumber to board windows by 300% as you walked into the door? Once upon a time, "That's how the free market worked!" for a lot of things. That doesn't make it ok.
As to what Oldschoolshooter says, I hear you. I remember Taurus' going for $275; how are those same guns worth 60% more just a few years later? Some opportunistic "capitalist" is looking to line his pockets off of someone's ignorance. And making a living off of others' ignorance is hardly an honorable way to go.
Why the gun market is not absolutely saturated, with almost as many guns in the U.S. as people, is beyond me. But I eagerly await the crash.