It looks like Numrich Arms (E-gun parts) has some in stock, even though it lists as a M39 part, that's what gets pulled up from the 469 schematic.. may want to call to verify fitment:
http://www.e-gunparts.com/product.asp?chrProductSKU=329720
Makes sense, the 1st & 2nd Gen guns are more likely to interchange as the internals pretty much stayed the same.
A quick eyeball check of my 559 and a 5904, it looks like the 5904 3rd gen is a tad larger in diameter, judging by firing pin hole in the slide.... but that could be due to old eyes playing tricks on me too.
http://www.e-gunparts.com/product.asp?chrProductSKU=329720
Makes sense, the 1st & 2nd Gen guns are more likely to interchange as the internals pretty much stayed the same.
A quick eyeball check of my 559 and a 5904, it looks like the 5904 3rd gen is a tad larger in diameter, judging by firing pin hole in the slide.... but that could be due to old eyes playing tricks on me too.