As to what receiver's grove you need, you're gonna need to find and measure---either with your local Gun Smith's help, website info, or what Optics Planet may have as info for your model of rifle. I'm sure some website has the info you need? Most if not all USA rifles have 3/8 grooves as a standard, if they were truly made here in United States, but when gun's are made by foreign maker's and imported under a US Gun Maker's name, then it could be anything. Funny thing is now WalMart is now carrying medium rings for 1" scopes(40mm with "NO" A/O) with grooved 3/8th receivers now, and they also carry a nice little Tasco 4 power scope with included rings for 3/8th grooved for $39.
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