The 1986 one was the most sweeping, but, the left has been trampling on the 2nd Amendment for some time. I don't care if I can have a handgun or hunting rifle. I want the people to be able to fight tyranny.
While it's the left now, it was rightwing racists who initially trampled on the 2nd. After the Civil War, they insisted that the newly-freed blacks couldn't be allowed the same gun rights as whites. The beginning of the slippery slope.