Another e-mail throws cold water on the idea:

Your emailer should start paying attention to the People’s Republic of California, where bills are trying to be passed to outlaw semi-automatic weapons. For those of you not so inclined, semi-automatic weapons are the most common type in the world. You shoot, the weapon cycles the next cartridge in and you have to release the trigger and pull it again to shoot again. On a fully automatic weapon, once you pull and hold the trigger it continues to fire as soon as the next cartridge is cycled in. Quite a difference, especially since fully automatic weapons are already outlawed for ordinary citizens by the Feds.
And for Giuliani to make gun control a Federalist issue will make him figuratively DOA.