From Kotobukiya. M.S.G WEAPON UNIT42 is Folding Arm, designed to be a multi-purpose unit with a variety of uses! 3mm joints have been used throughout this unit, allowing for a wide range of articulation. When stored, it is almost completely square and does not interfere with the overall silhouette when equipped. Each part can be separated and used as a connector part. As the unit utilizes 3mm joints, this also means all types of M.S.G can be used.