Weird face after Boolean..? I used the Boolean modifier to make a hole in my gun and it looks like a shadery face covering up the hole. It's a bit hard to see and it isn't really a face. The hole i made goes through 3 meshes. 

(You need to click on the pic to see the shady face)


Any solution?
It's because the 3 meshes' faces are overlapping. Move the faces of 2 of your 3 objects a tiny bit away (along normals or X/Y/Z).