Check out Grenade on table Free 3D model on CGTrader for free. High-quality mesh by MM-Creations: 350000 polys, 350000 vertices.
STL (Stereolithography, filesize: 33.7 MB), OBJ (OBJ, filesize: 54.4 MB), FBX (Autodesk FBX, filesize: 21.8 MB), 3DS (3D Studio, filesize: 590 KB)