Check out 55mm FLAK VG2 GERAT 58 AUTOM FLUGABWEHRKANONE 3D model on CGTrader for $25. High-quality mesh by majdalenka.
STL (Stereolithography, filesize: 49.9 MB), OBJ (OBJ, filesize: 123 MB), STP (STEP, filesize: 11.8 MB), IAM (Autodesk Inventor, filesize: 13.5 MB)