$50 Soviet M30 122mm howitzer 3D model by Plutonius3d. Available on CGTrader with 5349 polys and 3216 vertices. Geometry: Polygon mesh. Check it out on CGHub.
STL (Stereolithography, filesize: 70.8 KB), OBJ (OBJ, filesize: 121 KB), 3DS (3D Studio, filesize: 91.3 KB), MAX (Autodesk 3ds Max, filesize: 124 KB)