Mount your scope to your firearm with this stable and secure Weaver Top-Mount Scope Adapter Base. Each Weaver base is machined to the tightest tolerances for a custom fit. Designed for the Weaver Tip-Off rings and gives you a Weaver-style rail for mounting optical sights. Lightweight and strong aluminum construction. Includes all necessary mounting hardware.
This base slides on to a rimfire 3/8" receiver groove and converts it to standard Weaver dimension of 7/8" wide. The base will also take 3/8", tip off style rings.