This low poly robot model is made and rigged in Blender 2.83. This model is properly rigged and it is very easy to animate since it is low poly.
BLEND (Blender, filesize: 967 KB), OBJ (OBJ, filesize: 99.2 KB), FBX (Autodesk FBX, filesize: 92.6 KB), DAE (Collada, filesize: 267 KB)