The ARX-7 Arbalest Side AS figure from Bandai's Robot Damashii line presents a compact, angular silhouette that captures the essence of the combat-ready Arm Slave. The primary finish blends gunmetal gray with deep blue panels and subtle white accents to highlight crucial vents and limb articulation. The model is sculpted with sharp edge lines, exposed hydraulics along the limbs, and a shield mounting that echoes the original machine's rugged design. Articulation is designed for dynamic posing with ball joints at shoulders, elbows, wrists, hips, knees, and ankles, plus oversize ankle rocker joints for stable stances. The kit typically includes a beam rifle, a shield, interchangeable hands, and optional effect parts to recreate action moments.

Within the Full Metal Panic! narrative, the ARX-7 Arbalest is Mithril's pinnacle assault Arm Slave, built to counter overwhelming threats in a world where battles erupt aboard military bases and city streets. Piloted by Sousuke Sagara, a hardened young officer with uncanny combat instincts, the Arbalest functions as more than a weapon: it is a mobile command platform capable of high-speed melee and long-range engagements. Its shield and beam arm, alongside rapid-fire support options, enable intense defense and offense against insurgent forces. The Side AS variant embodies hybrid engineering, merging heavy firepower with agile, near-human reflexes, and becomes central to several mission arcs that test trust, loyalty, and the cost of protecting others.