Unity fbx export has resulted in a destroyed looking mesh Ok so I'm making an unturned mod and I made the gun model in blender and exported it into unity as an fbx. Now when I exported it and opened it in Unity, the model looked destroyed and many faces of the gun was missing. I tried switching shaders of the material but to no avail. I cant figure out if its something in Unity or how I exported the model through Blender.
All you need to do is invert normals to right direction.

In edit mode:
Easiest way is select all faces by "A" > recalculate by "CTRL+N". This work in most cases. Usally does not work in non-closed/un-manifold meshes

Second way is manually select normals which you need invert and press "SPACE" > start typing "flip normals" > "Enter".