Does the Machine Gun also affect the player using it?
No the machine gun does not attack you as well. When you attack you can only attack other players and it specifies that in the rules. The only time you can do damage to yourself is on weird woods and when a card says you can target any player with damage.

The problem with being able to damage yourself with the machine gun is that there are roles that want to die first and being able to damage yourself like that would make it to easy to win.

Rules


  Attack other player(s)