$5 AK-176 naval gun turret 3D model by tiger-fire. Available on CGTrader. Check it out on CGHub.
STL (Stereolithography, filesize: 53.2 MB), OBJ (OBJ, filesize: 9.41 MB), 3MF (3D Manufacturing File, filesize: 582 KB), MAX (Autodesk 3ds Max, filesize: 11.9 MB), FBX (Autodesk FBX, filesize: 4.93 MB)