In times past, yes. Nowadays however gun-rights activists indeed are heavily recruiting minorities to try and appeal to them. The NRA brought on Colion Noir (a black gun owner/vlogger) as a spokesperson, and they were very quick to jump to Shaneen Allen's defense when she (a black woman) was arrested in New Jersey for accidentally violating one of their draconian gun laws.
Simply put - trying to paint the NRA or gun rights activists as racist is a trick that simply doesn't work anymore. 40-50 years ago it was true, but back then half the country was racist. The whole country - including the gun rights movement - has come a long way.
No. Even today, gun laws are enforced disproportionately against blacks.
Best evidence of that is New York's stop and frisk laws. That was basically an experimental suppression of the 4th Amendment. They arrested people mostly for drugs and secondarily for guns. There was lots of court testimony to show that the stops were disproportionately used against blacks.
The overall result was to take guns away from blacks. A lot of black people said they didn't carry guns because they were afraid of stop and frisk. White people didn't have to worry.