Hi guys, I enjoyed finding this forum and I hope someone might be able to help. I have a old 686 with 4" barrel what I bought in 1988. It is modified for moon clips and I competed a bunch of years in IPSC. Years passed and I found the joy in using it for this purpose again. BUT: As I got quite older, I have problems with the sight. So I would really like to replace the rear sight with an adjustable fiber rear sight. Whatever offers I managed to find over here in europe, are for the newer round tang and I would need for square tang (old). Is there anyone who can help me giving that old gun a new purpose in life and tell me a solution? Maybe there is some way just to replace the rear sight blade to one with fiber? Thanks a lot in advance!