Weird spiky shading

I’m some what new to ue4 and I’ve made a weapon in blender that I exported it as a fbx file into ue4, I didn’t get any errors, but I got a shading issue, I made sure that I had a light map and no overlapping uvs, but I still get and issue and I will be happy if anyone could help me out. Thank you

Uv map and light map

Looks like a smoothing group problem so thats where you should start searching(i dont use Blender). Btw, you dont need to worry about lightmaps or lightmap UV’s for dynamic objects like weapons.

Thank you for answering I ended up fixing the problem by messing around with the smoothing group process in blender.