"Light pitting" to some might mean a sewer pipe to others.

I'd have it checked out by a knowledgeable person. If you get it cheap enough a few pits might not hurt it as a shooter.....pits just collect powder and plastic residue and keep getting deeper with time. If you got an older gun with say 30 thousands wall thickness and a Pitt that could be 10 thousands of an inch deep you;re not going to have much wall thickness left after honing.

The key is cheap enough remember a sleeved or Teague lined gun is not worth anything like an original Purdey.

And a gun with little or no choke is not worth anything to me as a hunting gun.