It declined to review Kachalsky, one of the cases in which a plaintiff sought to secure the recognition of Second Amendment rights outside of the home.
As SCOTUSblog notes, there is a split among lower courts on this issue, so the decision is something of a surprise. Kachalsky is a New York case in which a court upheld restrictions on gun-carrying; in Illinois, Judge Richard Posner found that Supreme Court precedents imply a right to carry.