I'm under the impression the majority of gun deaths are caused by obedient soldiers salughtering civilians. Democide. Death by government.
That might be followed by soldiers killing other obedient soldiers from a different plantation.
If you want to ignore all those deaths and just go with "civilian" caused gun homicides, I don't think white men are by percent the leaders in that category in the USA anyway.
I'd say the leading cause of "gun threats", a category that doesn't include a death, just a threat to kill somebody if they don't comply with the threat would be the ones all the plantations use against their respctive serfs to gain control over them.. Much of that threat is centered on confiscatory funding for "schools" where they teach kids not to bully, or threaten people. Crazy huh?