$20 MI Abrams Main Battle Tank Low-poly 3D model by kalaharians. Available on CGTrader with 213976 polys and 426098 vertices. Check it out on CGHub.
STL (Stereolithography, filesize: 6.3 MB), OBJ (OBJ, filesize: 14.1 MB), FBX (Autodesk FBX, filesize: 236 KB)