The ejection side barrel extension lug tip causes the scratches as you are cycling the ammo out by hand. The ejector will put tension of the case, and as the tip clears the chamber cut, the tip smacks/scraps down this right lug. During live fire, the barrel pressure holds the case solid on the bolt face, so these scraps are just hand cycle problems and are being caused on the way out of the chamber.
And since you may doubt me, load a single round, then as you draw the bolt back, put pressure on the right had side of the case before the bullet tip clears the chamber, then allow the tip to clear the barrel extension and take a good look at the case (read do not allow the cant to touch the lug tips.
Now if the XM-193 if neck splitting as well as the wolf (not just a chunk out of the XM-193 mouth*), then you have problems with the chamber. Either the headspace is too long, or the mouth chamber cut was made too large and allowing the cases to balloon. Bluntly, if this upper/rifle is splitting cases on everything you shoot, then it needs to go back and be checked by the shop/supplier. If you bought this rig used, then chances are someone destroyed the chamber by incorrectly hand chamber polishing, and you need to either get your money back, or it’s time to pony up for a new barrel.
* Some of the XM-193 have end of necks that are bulged/folded, and when you shoot this defective round, that section of the mouth is going to shear off from the case.