$50 Game Ready Sci Fi Mech Robot Rigged PBR Low-poly 3D model by Ferrum3D. Available on CGTrader with 538231 polys and 541956 vertices. Check it out on CGHub.
BLEND (Blender, filesize: 148 MB), OBJ (OBJ, filesize: 79.8 MB), FBX (Autodesk FBX, filesize: 57 MB), PNG (PNG, filesize: 118 MB), DAE (Collada, filesize: 71.1 MB), STL (Stereolithography, filesize: 51.4 MB)