Line on rear of receiver - cause for concern?

[Eskew5]

I've noticed a faint line or difference in the metal color about halfway down the rear of my receiver. Does this look like any cause for concern? Gun is a Group Industries.

 

[KickStand]

It’s hard to tell from your photo but it looks like it’s just minor wear from a folding stock attachment.

 

[brenbuilds]

That is absolutely finish wear. No cause for concern.

 

[Samuel_Hoggson]

Finish wear, as said. A backplate weld failure will be visible as a line and separation just ahead of the backplate, not on the rear surface.

 

[Eskew5]

Thanks all! I had read and article about the Group guns sometimes having weld failures on the rear and then noticed the line and became concerned. I typically keep a fixed stock on the gun and guess I had just never noticed. Much appreciated!