These seem fairly difficult to find. I have an old Weaver B6 with a 3/4" tube. I would like to mount it to a Weaver base, but cannot find the rings! Anyone else?
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http://www.rimfirecentral.com/forums/showpost.php?p=3572922&postcount=2 said:Some folks buy 1 inch rings and use an adapter like the Delrin Ring reducer
About the only source of an authentic 3/4th inch ring today, would be the used market. Try ebay, search "3/4 (weaver,redfield,tasco)".
If you're really desperate, you could always buy a Tasco rimfire 3/4th inch riflescope, and use the cheap supplied 3/4 inch rings.