He was mayor, not Governor, or President, or a Judge so to my knowledge he didn't "create" law.
He did revoke the handgun permits of many formerly law abiding NYC residents, turning them into instant criminals unless the surrendered their handguns.
He did file a large civil suit against legal firearm manufacturers, which went no where, but was an attempt by the Mayor of NYC to "legislate" throughout the country.
He is supportive of ugly, aka assault, weapon bans, as well as handgun bans on a local and state level. That's irrelevant as Mayor, a significant issue as President.
As to Florida allowing felons and child molesters to posess firarms, in violation of federal and I'm sure state law, I don't believe you.
If felons posess firearms in Florida, and of course some do, that's a failure of law enforcement. And the greater the failure, imo the greater the need for citizens of Florida to have the means to protect themselves.
Rudy's position would simply be to ban firearms in florida.