The US has more civilian firearms per capita than any other country and firearm death rates far above peer nations. Policy debate covers who may purchase, what may be sold, how transfers are recorded, and what the Second Amendment permits legislatures to do.
Firearm deaths divide roughly into suicides, which are consistently the majority, and homicides. Mass shootings account for a small fraction of the total while driving a large share of public attention and legislative response.
Federal law requires licensed dealers to run background checks. Private transfers between individuals are not federally covered, though many states impose their own requirements. The scope of this gap is disputed.
The Supreme Court has held that the Second Amendment protects an individual right and has established a test emphasizing historical tradition of firearm regulation. Lower courts continue to apply that standard to a wide range of state and federal laws.