Then try getting a permit. In DC a security guard had to go all the way to the US Supreme Court to get permission to have a gun, won the case, and he still
couldn't get the city to issue him a permit without another year of legal action. In Chicago you have to get a license to own a gun, paying big bucks on top of the State Police license, and gun sales are banned. Then you're only allowed one operable gun, and can't even take it to your garage. New York state has the strictest gun laws in the nation, and New York City is insane, requiring licensing in all sorts of ways, including a requirement to pre-approve your schedule when you move your pistol to a shooting range and back.
And those three cities account for about quarter of all US gun homicides. Toss in Philly, Detroit, Baltimore, and LA, all extremely restrictive, and you've got about half the murders accounted for.