No ADS, never-ending bullets, and high damage to stomp hoards, mutations, and bosses. Best suited on Karlee for a Tec 9 / Tac 14 combo, or Holly to keep hit points up as you go. Use a Tac 14 (or M870) and fast-firing sidearm like the Tec 9 or Glock Auto.
Attachments
Sidearm: Compensator, Extended Mag or Reload Speed, Movement Speed
Shotgun: Rifled Barrel, Stumble or High Damage, Swap Speed