Sigman not only the shoulder, the transformation is not so clumsy and stupid, much better than the old bodies of God and Sol. But looking at the hole at the armpit, the design should resemble that of God instead of Sigma
Looking carefully at all photos, the joints are really in this way, all photos have holes at armpits . Then all the weight of arm will be supported by that small shoulder hinge joint, the joint will be loosened soon. If possible , I will put the arm back to the hole
I like gravion, I ordered and treat it as a display.
looking at the design, the cannons on both sides will block the way of the arms if they are fit into the original holes on armpits , so they are forced to be inserted into another new holes like the 3rd party taiwan optional joint design...........that's bad