Low rang anti air weapon, muzzle type, rotating base, good for warships & moving surfaces.basic design in google sketchup
use the f3d extension to get similar results as photos
SKP (Sketchup, filesize: 1.71 MB), F3D (Autodesk Fusion 360, filesize: 615 KB), STL (Stereolithography, filesize: 660 KB), 3DS (3D Studio, filesize: 610 KB), DWG (AutoCAD, filesize: 1.97 MB)