The most effective forms of gun control should be focused on guns used in the majority of crime, which are handguns, but that's not the discussion that's being had because the gun debate is media driven, which is centered around mass shootings (greater shock factor, better ratings), which statistically are the rarest and of least concern by numbers (I think gun death/homicides by rifle < 300 even including mass shootings). https://www.bbc.com/news/world-us-canada-41488081
AR-15s are also very popular because they're a platform you can take an AR-15 lower, and or buy a cheap one and build up slowly over time until you have a very nice and accurate rifle. They look militaristic because their metal exterior but when people say they're identical functionally to hunting rifles, they're not lying when it comes to the part that handles firing the bullet.
I'll also leave people with this: https://twitter.com/BillGates/status/1138520780042465280