The main purpose of this legislation is to prevent states and local governments from imposing specific design requirements on handguns that are not commonly found on firearms used by the general public. It aims to protect the rights of Americans, particularly in states that may have strict gun laws, by ensuring that they can access a wider variety of handguns without additional restrictions. Key provisions of the law include a prohibition on any federal, state, or local regulations that would require handguns to have certain features that are not mandated by federal law.