The BEANO T-13 - Grenade Low-poly 3D model is available on CGTrader for $4. Original author: yolo137667. Specs: 10786 polys, 5639 verts.
STL (Stereolithography, filesize: 193 MB), OBJ (OBJ, filesize: 193 MB), BLEND (Blender, filesize: 193 MB), FBX (Autodesk FBX, filesize: 193 MB), TEXTURES (Textures, filesize: 193 MB), PNG (PNG, filesize: 193 MB)