The Memorial Gaburicalibur can combine with the Memorial Gaburivolver to form the Gaburu Cannon. Even though this has a longer blade compared to the DX version, this release comes with a smaller blade to make this configuration possible. Lastly, the item comes with two Zyudenchi, namely: Parasagun and Zakutor, which you can use with the Memorial Gaburivolver. This Premium Bandai web exclusive item cost 24,200 yen, and is set for a June 2024 release.
UPDATE (1/10/2024): Updated with Bandai Japan's better video review.