Bullet hole created in ZBrush.
.OBJ and original .ZTL file has versions with quads included and can be further subpatched, sculpted.
Other formats have decimated (triangular) mesh.
OBJ (OBJ, filesize: 1.49 MB), BLEND (Blender, filesize: 531 KB), LWO (Lightwave, filesize: 302 KB), MA (Autodesk Maya, filesize: 2.11 MB), ZTL (Zbrush, filesize: 730 KB), 3DS (3D Studio, filesize: 289 KB), MAX (Autodesk 3ds Max, filesize: 631 KB)