Part of the object becomes transparent when imported


I made a simple flashlight in Blender, exported it in .fbx and trying to import it to UE.
After import ive got this(pic 1). A place, where glass in real flashlight should be, have become transparent. But it should be opaque. Where is the problem? Blender and 3D Viewer picture is fine(same .fbx file). Havent tried recreating model in Blender yet. I`ll try to do it soon if nothing helps.



In Blender

In win10 3D Viewer

In the UE4’s wireframe view everything looks correct? Check if material which you use has the “2-sided” option turned on.