Quad Barrel Shotgun

Used in the most dire of circumstances, Optimus Prime can use the Quad Barrel Shotgun (クアッドバレルショットガン Kuaddo Bareru Shottogan) to mow down his foes with relative ease.
Fiction
The Last Knight film
When Nemesis Prime attacked Cade Yeager, Vivian Wembley, and the TRF aboard the Guardian Knights' ship and stole Quintessa's staff. Immediately after, Santos opened fire on the brainwashed Prime, leading Nemesis to return fire with his Quad Barrel Shotgun. After a brief, one-sided standoff, Nemesis stormed away, daring anyone present to challenge him.
Soon after, during his fight with Bumblebee, Nemesis used the shotgun to hold Bumblebee at bay, before dropping it on the hull of the Guardian Knights' ship. It is unknown if the weapon was lost following the skirmish or if Optimus reclaimed it before leading the attack on Quintessa's ignition chamber. The Last Knight
Toys
Generations

- Released just before the Japanese debut of Studio Series, the Quad Barrel Shotgun is a redeco of one of Age of Extinction: Generations Hound's, utilizing the color scheme in the film. It was given away for free by TakaraTomy if 4000 yen of Transformers products were bought from select stores starting on April 21 while supplies lasted. Despite starting long after the toyline was over, Takara's website characterized it as a promotion for The Last Knight.
Trivia
- Optimus's shotgun in the film seems to use a retextured CG model for one of Hound's shotguns. Similar to the aforementioned toy, the weapon's on-screen appearance has a red and blue flame aesthetic keeping in line with Optimus's paint job.

