Check out Animated Minigun Low-Poly GAMEREADY Low-poly 3D model on CGTrader for $8. High-quality mesh by kaynoux: 7884 polys, 8978 vertices.
BLEND (Blender, filesize: 1.34 MB), OBJ (OBJ, filesize: 717 KB), FBX (Autodesk FBX, filesize: 291 KB), DAE (Collada, filesize: 986 KB)