Go to an Arizona MVD location within 15 days of purchasing the vehicle, and the following documents:

• Bill of Sale (Form 48-2004)
• Drivers License
• Emission Compliance Form (for Phoenix & Tucson only)
• Insurance: Minimum levels are the following:
  • $25,000 bodily injury liability for one person and $50,000 for two or more persons
  • $15,000 property damage liability
• Lien Release: If there is/was a loan on the vehicle.
• Odometer Disclosure Statement (Form 96-0695)
• Original Title: From the previous owner.
• Title and Registration Application (Form 96-0236)

Out-of-State Purchase

• Vehicle Registration: From the previous owner.

Source: Arizona MVD (Title and Registration Topics), Arizona Dept. of Transportation (What is “mandatory insurance”?)

Arizona requires motorized watercraft operating on Arizona waters to be registered through the Arizona Game and Fish Department with the following documents;

• Arizona Application for Watercraft Certificate of Number (form 1532).
• Endorsed Bill of Sale.
• Form of Payment, for the fees and taxes.
• Manufacturer’s Statement of Origin, if the boat is new.
• Original Title/Registration, for used boats previously registered or titled in another state.

Out-of-State Purchase

• Original out-of-state title or registration

After a watercraft is sold or transferred, the buyer must apply to have the motorized watercraft registered in their name within 15 days. Nonresidents may temporarily operate a properly registered out-of-state watercraft on Arizona waters for up to 90 days.

Source: Arizona Game & Fish (Boating Registration Frequently Asked Questions), Arizona Game & Fish (Fees and Forms)

In Arizona, there is no registration required for a new owner of a firearm.