No one ever reads links but here goes anyway
http://www.cnn.com/2010/CRIME/06/28/us.scotus.handgun.ban/index.html
Look up these cases:
District of Columbia v. Heller (2008)
McDonald v. Chicago (2010)
In 2014, in Palmer v. District of Columbia, a federal judge overruled DC’s ban on carrying ready-to-use firearms in public. The same year, a federal judge struck down New York's seven-round ammo limit (10 rounds if being used in an incorporated firing range).
In Peruta v. County of San Diego and Richards v. Prieto, the 9th Circuit removed restrictive concealed-carry requirements in some California counties.
Gun rights advocates are finally on the winning side, but serious obstacles still remain. Legal challenges to assault weapon bans in California and New York have failed even in light of the Supreme Court's rulings in Heller and McDonald, thanks to the controversial legacy left by the Miller case ...
United States v. Miller (1939) began when bank robbers, Frank Layton and Jack Miller, were stopped by a cop while going from Oklahoma to Arkansas. They were carrying an unregistered sawed-off shotgun and were arrested under the NFA's Title II weapons provision.
Miller and Layton challenged the National Firearms Act as a violation of 2nd Amendment, but skipped town during the SCOTUS deliberation.
With no one to speak for them, the government held that the National Firearms Act was constitutional, arguing that the law was a revenue-collecting measure only, and not a gun control law. Because Miller and Layton transferred the shotgun across state lines, it fell under the Commerce Clause of the Constitution.
California's Fourth District Court ruled in 2013 that AK- and AR-type semi-automatic rifles are at least as "dangerous" and "unusual" as short-barreled shotguns, which were prohibited by the Miller decision. While outright assault weapon bans have not made it out of lower-level state and federal courts, blocked by the Miller ruling that only weapons "in common use" are protected by the Second Amendment, unfortunately California is seeing some substantial gun restrictions going into 2018.
New justices may be able to overturn those and restore our Constitutional rights though.
In the absence of a definitive Supreme Court ruling, it's still up to the states to decide which types of weapons are "dangerous" or "unusual."