Barrel Damage?

Looking at a friends barrel with the Teslong bore scope this is what we found in the stainless steel barrel.

Does anyone know what caused this? They kind of look like pressure rings with material erosion? Just a guess on my part.

Any help would be appreciated.

Thanks in advance,

Frank.
View attachment 294961View attachment 294962
This is mechanical damage, not from a projectile or erosion. Not from normal usage likely a tool did this somehow
 

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