Why Am Im Missing Faces When Importing Meshes From Blender?

Thanks, Mate it worked much love to you homie <3.

When I Imported my gun from Blender All my faces are not their is their any way to fix this?

Is it possible the normals aren’t facing the right way in blender? I recommend recalculating the normals and trying again. In Blender, go into edit mode and press Shift + N