Importing Bug... From Blender To UE 4.13

Hi, I have created my own AK-47 Model and made custom animations for it and whenever i try to import it as a skeletal mesh this happens:

If I import it as a normal mesh everything is fine. This is how I want it to look like:
Best Regards,

This is a bone scaling issue. Please watch my video listed below as this will help. You need to APPLY SCALE inside of blender otherwise your sizes will be completely off and distort animation.