Firearm purchase age raised to 21 is my first guess. This will take place on the state level and there will be a play for the Fed as well. This will mesh "well" with the same restriction on handguns that is in place. There might be lawsuits, but they're fail because handguns are currently restricted to 21+. Trump Bump Stock Ban court challenges will move through the courts as lawsuits challenge the Trump ATF's ruling . It may move quickly since there are already suits filed. The ban is expected to fail since it won't be difficult to debunk the ATF's core contention. Several pointless Anti bills will go through the House and die in the Senate.