Is This A Carbon Ring?

[JRock95]

Borescoped a rifle of mine to check on any carbon buildup. It almost seems that the area where the carbon ring would form looks different depending on if I insert the borescope from the muzzle end vs the breech end. I've attached some pictures. Is this a carbon ring, or just a shadow?

 

[bigunit]

Is there an empty in the chamber in the first Pic? Looks just like a dark spot before the leade.

 

[JRock95]

Is there an empty in the chamber in the first Pic? Looks just like a dark spot before the leade.

First pic has an empty case, yes

 

[huntnful]

That just looks like a dark shadow spot where the neck portion of the reamer stops.


In the picture where you have an empty case in there, a carbon ring would basically be touching the mouth of the case if it were there.

 

[wind gypsy]

That just looks like a dark shadow spot where the neck portion of the reamer stops.


In the picture where you have an empty case in there, a carbon ring would basically be touching the mouth of the case if it were there.

Why would it be touching the case? I've seen it build up like what looks like shown in the picture, that looks like carbon to me?