File contains two turrets that are exactly the same but with different texture maps applied.
Each individual turret+base has 20002 vertices and 10858 polygons. No LOD variants. These tex maps won't take kindly to mip mapping. The 2 materials rely on the texture maps. The texture maps should be packed in the .blend but in case it fails to work I have included the texture maps in the .zip. Blend file comes with 2 lights and camera. Guns and bases are separated. Gun texture maps are 2000x2000. Base texture maps are300x300. The tiny black spot in the bottom of the middle tube on the texture map has been fixed. I don't know if the .mtl file works in the .obj download, but the textures load up nicely in Blender.
Has edge split applied in OBJ file so it does contain vertices that occupy the same area, this is to add sharp edges to an otherwise smooth surface.