I did a little research on the 559 I just bought. Most of the 1800 plus 559`s used the short stubby extractor. Mine has the 39-2 extractor, looks the same as the one on my 5903. It`s long and thin. According to the bluebook guys, only 200-250 559`s were made with the 39-2 style extractor. Very interesting. My 539 has the stubby one.