I'm not seeing any either, Hubert - even enlarged the pictures, but the quality wasn't very good.(CTRL +) and didn't show any nor any what might have been checkering borders. could be my monitor or my eyes, too.

I like the rifle. Was thinking those projections over the chambers might act as a guide or at least not hinder laoding too much if any.

Handling the gun would be the only way to find out, now if only the owner would send it post haste - I'll do the testing and report straight back to the forum.