Looking for Medieval cannon? Get this 3D model from dima-vasin via CGTrader for $25. Technical specs: 412734 polygons, 208460 vertices.
MAX (Autodesk 3ds Max, filesize: 9.09 MB), OBJ (OBJ, filesize: 35.5 MB), FBX (Autodesk FBX, filesize: 3.87 MB), DAE (Collada, filesize: 68.1 MB)