A situation like this is hard to diagnose without actually looking at the gun. With light visable at bottom, but not at top, sounds as if bbls are not totally fitting the face square. The "May" have left the factory like that or "May" have had some of that Aftermarket fitting mentioned. Also note, not all guns were made to have the lever to the right, but always came to center, regardless of wear or lack there-of. This is I believe found more often on British or Continetal guns than on American ones, though at least some US ones are also made this way. "IF" this was the case with this one it would definitely have been tampered with.
