The barrels are the heart of any double. Have them looked at and evaluated before you go any further. When you get right down to it, it sounds like you are trading a gun with no issues, that suits you, for one with issues that does not. Chokes, barrels with pitting, stock finish not to your suiting and the need to have a leather recoil pad installed seems like a big list of minor problems. Does putting another grand or two into the gun make it make any sense to buy? If the answer is no then pass. If yes then proceed with caution.