In case it will help, here is a photo of the AHG 9758 sight mounted on an Anschutz having an 11.02mm wide dovetail. This is an 18mm diameter sight with a height from base to center of 22mm. The 22mm diameter sight would be a little taller. Gehmann and Centra advertise front sights to fit current FWB, but I don't know if they would fit your rifle or not. In any case if you can't find a stock sight to fit, I would think it possible to open up the dovetail on the 9758 to fit your rifle. I would remove the sight base from your rifle, and take it to a competent gunsmith along with the new sight and have him machine the sight to fit the base. This is bread and butter type work for a gunsmith, and should be able to be done for a reasonable price.
Thanks for the image and information. From the looks of the cut on the 9758 front sight I can modify it with a straight end mill in my small 30's era horizontal mill if needed. I'd like to stay with a 18mm sight as I have inserts already.
Justin
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