$6 Rifle Chainsaw Attachment Low-poly 3D model by Akinaro. Available on CGTrader with 16910 polys and 9100 vertices. Check it out on CGHub.
BLEND (Blender, filesize: 94 MB), BLEND (Blender, filesize: 94 MB), OBJ (OBJ, filesize: 93.3 MB), FBX (Autodesk FBX, filesize: 92.7 MB), GLTF (glTF, filesize: 58.4 MB), DAE (Collada, filesize: 94.3 MB)