The Armored Core VI: Fires of Rubicon IB-07: SOL 644 figure from Robot Spirits is a highly articulated representation of the Side AC unit. The sculpt preserves the compact, torso-forward stance with broad shoulder armor and segmented leg plates, capturing the lean, purpose-built silhouette of a capable battlefield fighter. The surface treatment alternates polished metal tones with matte blacks and subtle color accents to emphasize joints and panel lines. Detailing includes exposed servos at the knees and elbows, panel gaps, and riveted armor plating, plus a carefully reproduced head unit with a forward-facing sensor array. The figure offers multiple points of articulation along the spine and limbs, enabling dynamic poses. Accessories include the standard armaments and optional action poses reflecting its squad-role in the Armored Core universe.

IB-07 SOL 644 is a prototype Side AC developed for high-risk reconnaissance and close-quarters combat on the Rubicon front. Designated 'Sol', the program sought a balance between armor resilience and reactor efficiency. The '644' sequence marks its production batch, featuring enhanced heat management and modular weapon racks. In the Armored Core VI narrative, IB-07 SOL 644 operates with a small pilot unit team, often deployed in contested ruins where conventional forces struggle to survive. The unit's operations emphasize stealthy approach, rapid thrust, and collaborative tactics with other mechs. The figure commemorates this distinctive design, capturing its compact profile, sensor array, and unique armor geometry. This figure invites fans to imagine its battlefield history, from preliminary trials to frontline skirmishes against rogue AI. The lore surrounding SOL 644 highlights themes of resilience and adaptation in war-torn space.