Gun control already does exist in the US, but as was previously said, it's enforcement and how much there is really does depend on where you live.
Personally I have mixed feelings on modern gun control in this country, as (being a member of multiple minority groups) I am a firm believer in the notion that armed minorities are harder to oppress and that queer people like myself should, at the very least, learn how to handle a firearm (even if you don't personally want to own one. I myself am in the latter case and much prefer carrying a knife with me), especially so with how much anti-queer (anti-trans especially) sentiment and violence there is in this country nowadays.
Especially so because we have a history in this country of groups that are normally
against gun control suddenly supporting it when the 'wrong' people are participating in their Second Amendment rights.
Case in point: the
Mulford Act, passed in 1967 in California that prohibits the public carrying of loaded firearms without a permit. This law was literally passed in response to the Black Panther Party, who had formed the previous year and their core practice at the time was their open carry patrols in order to protect black citizens from police brutality and police violence.
The NRA supported the Mulford Act.
And I am going to be completely honest here: I don't think there's any way to describe the Mulford Act as anything
other than a racist law - one of many in the history in this country (even going back to colonial times) designed to disarm black people, Native Americans, and other minority groups.