Is this the "colonial musket" argument? If not, do you care to elaborate?
"Legitimate" reason? Is this the "hunting use" argument? Once again, do you care to elaborate?
Because at this time, there is no law against collecting a large number of firearms.
As a matter of fact, I have.
And not that it has any bearing on the current topic, I might add that my own father was shot and nearly died from his injuries. He never completely recovered from it.