Check out Military Barricade - Pyramid Obstacle 3D model on CGTrader for $5. High-quality Polygon mesh mesh by xtreme3d: 248 polys, 288 vertices.
BLEND (Blender, filesize: 163 KB), OBJ (OBJ, filesize: 7.86 KB), 3DS (3D Studio, filesize: 8.78 KB), DAE (Collada, filesize: 40.4 KB), STL (Stereolithography, filesize: 25.7 KB)