- "Semi-auto shotgun. High damage spread with superior mobility."
- — In-game description
The SG12 appears in the zombie maps Voyage of Despair, IX, Blood of the Dead, and Classified, where it's available as a weapon within the Mystery Box for 950 points. When upgraded via Pack-a-Punch Machine, it becomes the Breccius Rebornus with the magazine size increased to 20 shells and changed to be fully automatic.
- The upgraded SG12's name, the Breccius Rebornus, is a reference to the 205 Brecci, a semi-automatic shotgun from Call of Duty: Black Ops III.
- "HANDLE CAREFULLY. DO NOT MOLEST." can be seen on the weapon