I genuinely think an armed Antifa or BLM march would do infinitely more for the gun control movement than every gun control rally ever held, literally just because it'd scare the hell out of Republicans. Though they'd probably try to make an exemption so it's allowed for "their" guys but not anyone else.
Considering that black people are disproportionately convicted under current gun laws, many only having commitied the crime of illegally owning a gun for self-defense because they live in dangerous areas, areas made dangerous because of drug prohibition & decades of collective trauma from aggressive policing & socialoeconomic discrimination. Any additional gun law would probably be a hug blow to black communities.