That's a vague question. In the U.S. there is no national registration and only a few states require it.
Not required
The California Department of Justice web site has current CA gun laws.
The state of Missourid does not require registration, so the answer is, you don't register it.
The federal government of the USA does not require you to register handguns, so if you are referring to federal laws, there are none. State laws vary. For instance, NH does not require the registration of handguns, while some other states do.does the state of Indiana require you to register a hand gun that you own?do you have to register a hand gun that you own in the state of Indiana?What are the hand gun laws in Indiana?
Go here: http://www.ichv.org/summarylaws.htm
depends on where you are. In most of the US there is no registration of firearms.
Contact your local police.
New Mexico's gun laws are pretty lenient. New Mexico does not require a hand gun to be licensed or registered.
To register a gun purchased in Oregon from a private party in California, you would need to first ensure that the firearm is legal to possess in California and meet the state's requirements for firearms registration. You would likely have to submit the necessary paperwork and fees to the California Department of Justice, specifically the Bureau of Firearms. It's important to consult with legal authorities or experts to ensure compliance with California's gun laws.
The California Deptartment of Justice web site has all the information you need.
No. As in most states, no registration of ordinary firearms is required.
Depends on the law of your state. It is not required under Federal law