$12 ZIS-3 76-mm divisional gun Low-poly 3D model by OK3D. Available on CGTrader with 3700 polys and 4372 vertices. Check it out on CGHub.
BLEND (Blender, filesize: 22.7 MB), OBJ (OBJ, filesize: 22.7 MB), FBX (Autodesk FBX, filesize: 22.9 MB), PNG (PNG, filesize: 22.7 MB), TEXTURES (Textures, filesize: 22.7 MB)