The M18 Smoke Grenade Low-poly 3D model is available on CGTrader for $4. Original author: yolo137667. Specs: 5304 polys, 2682 verts.
STL (Stereolithography, filesize: 459 MB), OBJ (OBJ, filesize: 459 MB), BLEND (Blender, filesize: 459 MB), FBX (Autodesk FBX, filesize: 459 MB), PNG (PNG, filesize: 458 MB), TEXTURES (Textures, filesize: 458 MB)