Champion's choice makes this nifty adapter bushing that lets you use Euro-thread accessories in US-thread sights:
http://www.champchoice.com/store/Main.aspx?p=ItemDetailOptions&item=PH999
Great gadget, you can use the same iris on every aperture sight that you own. The only disadvantage I have found, is that if you have one of the German irises with a magnifying lens, the smaller opening in the US sights will cut off part of your field of view.
Here's one In action - joining a Gehmann iris to a Williams sight, on an old HW 50.
http://www.champchoice.com/store/Main.aspx?p=ItemDetailOptions&item=PH999
Great gadget, you can use the same iris on every aperture sight that you own. The only disadvantage I have found, is that if you have one of the German irises with a magnifying lens, the smaller opening in the US sights will cut off part of your field of view.
Here's one In action - joining a Gehmann iris to a Williams sight, on an old HW 50.
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