The legality of buying a katana, or any bladed weapon, varies depending on your jurisdiction and local laws. In some countries or regions, there may be restrictions or regulations on the purchase, possession, and transportation of swords or bladed weapons, including katanas. These laws aim to regulate the ownership of potentially dangerous weapons and ensure public safety.

To determine the legality of buying a katana in your specific location, you should research and consult the laws and regulations of your country, state, or municipality. This may involve looking into laws regarding edged weapons, concealed weapons, age restrictions, and any permits or licenses that may be required.

It is essential to comply with the applicable laws and regulations to avoid legal issues and ensure that you are acquiring and possessing a sword in a lawful manner. If you are unsure about the specific regulations or have any concerns, it is advisable to consult with local authorities, law enforcement agencies, or legal professionals who can provide accurate information and guidance based on your location.