ARMORED CORE WEAPON UNIT 018, Large Grenade Cannon: OIGAMI, is a giant, articulated grenade launcher that can connect with the weapon slots on both sides of an AC's back.

This grenade cannon measures a whopping 400mm in length, making it one of the largest weapon units in the ARMORED CORE WEAPON UNIT series.
The cannon can move from stored mode to firing mode without replacing any parts. Even when folded, it’s so large that it almost hides the AC itself.

Figures shown not included (sold separately)