Mark my words.... they're coming for "sniper rifles." What is a sniper rifle? Whatever they want it to be!
What MIGHT induce legislation is if some "important" person has their head misted by a long shot. PRS guy with a can on the end of his rifle, 100s of yards away from the victim. He or she will initially escape capture but eventually will be caught once more evidence piles up after repeated shootings.
I'm thinking they will probably go after the ammo first.
DC sniper wiki They didn't use a bolt-action but a Bushy AR...

There are a lot of hunters, especially older types, who could give a rip if ARs are banned. Take away their deer rifle, the gun grabbers will have a much bigger fight on their hands.
During the Hunter Safety courses I've mentioned this and how ALL gun-owners have to stick together.