Check out DF9 Turret Low-poly 3D model on CGTrader for $10. High-quality mesh by deunank: 13416 polys, 7033 vertices. PBR, Textured, UV Mapped.
BLEND (Blender, filesize: 11.1 MB), FBX (Autodesk FBX, filesize: 425 KB), STL (Stereolithography, filesize: 182 KB)