I made a weapon model in blender, I can't remember exactly when or how I ended up with these edges because I made the model a few days ago, however I came back to the model to use it as something to learn how to UV map with. That's when I noticed these edges on this face, the face is not meant to be separated like this, on the other side it appears normal but on the side with the bolt two edges appear, when I try to dissolve them nothing happens, if I completely delete them the whole face disappears.
In wire frame view in case it helps:
There maybe extra vertex. In edit mode select all vertex and run "Remove Doubles" Or you will need to go corner by corner of the face and see it you need to merge any vertex.