It messed up your normals.On the ejection port for example something like this happens:
How to fix this: edit normal modifier, unify normals, run script again maybe it works ok after that.
Do what respawnrt suggested. If that doesn't work, reset xforms. If that doesn't work, create a box, collapse the stack, attach the gun, delete the box. If that doesn't work, export to OBJ, reset Max, import OBJ.
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How to fix this: edit normal modifier, unify normals, run script again maybe it works ok after that.
You should try what respawnrt suggested, if that doesn't work, post the wires of that area.
It only happens on a angles and it looks 100% fine in a render?