Naval Cannon 3D model is available on CGTrader for $6. Original author: tiger-fire.
STL (Stereolithography, filesize: 485 KB), OBJ (OBJ, filesize: 956 KB), FBX (Autodesk FBX, filesize: 532 KB), MAX (Autodesk 3ds Max, filesize: 2.33 MB), MS (3ds Max macroScript, filesize: 369 KB)