The Lupin Magnum is from Kaitou Sentai Lupinranger VS Keisatsu Sentai Patranger (2018–2019), the crossover between the thief-themed Lupinrangers and the police-themed Patrangers. It is the personal weapon and personal mecha of Lupin Red (Kairi Yano) and is presented in the show as the single most powerful piece of the so-called Lupin Collection. It is not the season's main Megazord — those roles belong to Lupin Kaiser and Pat Kaiser — but rather a transforming weapon-mecha. Because Lupinranger VS Patranger was never adapted into a Power Rangers season, the Lupin Magnum was released only in Japan and never as a Power Rangers toy.

The mecha has two configurations: an oversized revolver (Gun Mode) that the giant robot Lupin Kaiser can wield as a firearm, and the Robo Mode shown here, in which the gun stands up into an independent humanoid robot (referred to on the show as its compact 0.5 form). In Robo Mode it fires laser bolts from the barrels on its forearms and can revert to gun form at any time; like a Dial Fighter it opens the Gangler villains' safes using its dial. For finishing moves the Lupin Magnum is enlarged and held by Lupin Kaiser (the Blow 'Em Away Magnum attack) or by the super-robot Good Cool Kaiser VSX.

As a toy, the DX Lupin Magnum was released by Bandai Japan in 2018, built mainly from ABS plastic. Its core feature is the gun-to-robot conversion: a rotating dial selects the transform symbol, and pulling the trigger deploys the legs while electronic sound and voice guidance play. The gun form fits into the hands of the DX Lupin Kaiser figure, and the separately sold VS Changer (the series' morpher toy) unlocks additional attack sounds. The Lupin Magnum only ever existed in this Japanese DX release.