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The Top Mount Base - #48 (Gloss Black) from Weaver has been machined to tight tolerances for a custom fit. This aluminum base offers maximum strength so that the rings will hold tight.
Rear base for Winchester 54, & early model 70 with Serial No. below #66 350.
Note: The Winchester 54, & early model 70 with Serial No. below #66 350, 60, 67 & 68 may require bolt and/or safety alteration otherwise the firearm will not function safely and properly. Consult with a qualified gunsmith.