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The Top Mount Base - #57 (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.
Front Base for Winchester 52 (hole spacing different)
Note: the Winchester 52 may require bolt and/or safety alteration; otherwise the firearm will not function safely and properly. Consult with a qualified gunsmith
Note: the handiest way to pinpoint the correct base for the Winchester 52 Rifle is
to check the spacing of the tapped holes for the rear base and compare it to the hole spacing
for the front base. If the hole spacing is the same use 46+ 46. If the hole spacing is different use 25+ 57