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Bruce, it is not specified that I can find. I would verify this with Weaver at 800) 379-1732. A representative will be available to answer your calls between 8 a.m. - 4:30 p.m. CT Monday through Friday. Or by email inquiry here : http://www.weaveroptics.com/general/contact_us.aspx

call Weaver (800) 379-1732 8 a.m. - 4:30 p.m. CT Monday through Friday Or email here : weaveroptics.com/general/contact_us.aspx

Bruce, Yes this base does come with screws needed for fastening to pre tapped and drilled holes on your 336. If you loose one the screw size is 63B