Check out Superlaser Siege Cannon Low-poly 3D model on CGTrader for $20. High-quality mesh by MetaBallStudios: 4114 polys, 2269 vertices. PBR, Textured, UV Mapped.
C4D (Cinema 4D, filesize: 1.14 MB), OBJ (OBJ, filesize: 468 KB), FBX (Autodesk FBX, filesize: 7.65 MB), C4D (Cinema 4D, filesize: 1.14 MB), TEXTURES (Textures, filesize: 8.98 MB)