Atticus says that mrs. Dubose is a model of real courage rather than "a man with a gun in his hand" What does he mean? Do you think he is right?

Atticus is referring to the fact that Mrs. Dubose has an unbelievable amount of inner strength..... a man with a gun isn't courageous, facing death with diginity is.

Yes, I completely agree with Atticus' summation.