The shooting, which left four dead and 17 injured, is just the latest spurt of mass violence made possible by the small 3D-printed part known as a “conversion device,” “Glock switch” or “auto sear.”

Birmingham, Ala.– Mayor Randall Woodfin called on the state Legislature to pass a glock switch ban after gunmen launched a barrage of bullets during a targeted hit in a crowd in downtown Birmingham Saturday night.

The mass shooting in the Five Points neighborhood of Birmingham Saturday night has led to new calls to ban devices that turn semi-automatic firearms into automatic ones. But it’s not clear if the proposals – introduced in the previous two sessions – can pass in a Legislature that has loosened most gun restrictions over the