This 3d robot model is made in Blender. It looks realistic. It has high quality PBR texture. You can use it in your project. ( I don't think the price is too much , although you can also offer price to me)
OBJ (OBJ, filesize: 132 MB), DAE (Collada, filesize: 179 MB), ABC (Alembic, filesize: 87.1 MB), FBX (Autodesk FBX, filesize: 45.4 MB), BLEND (Blender, filesize: 227 MB), GLTF (glTF, filesize: 148 MB)