So microtech got back to me today. This was their reply:
Thank you for reaching out to us. I would be happy to address your concern. If you are referring to what appears to be a crack on the back side of the knife close to the thumb stud on the handle or down towards the lanyard hole on the back side near the handle screws, these are tool markings that are made during the machining process. Unfortunately this is a feature that cannot be avoided when we machine the chassis. I am told that path the tool travels does not allow for this to be corrected with the current design. This mark does not compromise the functional integrity of the knife in any way. All of the Socom Elite manuals contain these marks.
I sent in some pics just to sure and they verified its from the machining. I must have not noticed them before. Glad to hear its not an issue.