Feinstein is not intelligent enough to draft legislation. I'm sure she is intelligent enough to accept drafts from anti-gun groups and present those as her own work product.
While mayor of San Francisco she did preside over several extremely restrictive gun control laws, and at one point actually surrendered her .22 target pistol on the same day she received her concealed carry permit for her .38 revolver. Apparently, in Feinstein's world gun control applies to everyone other than herself. Now that she is in national politics I'm sure she is constantly surrounded by armed security forces while pursuing her goal of disarming the unwashed masses.