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The Leupold STD mounting system is a simple, yet secure mounting solution for attaching a riflescope to the receiver of your favorite firearm. STD rings and bases are extremely dependable, and they can be combined in a variety of configurations to suit your shooting needs.
STD Extension Rings are made of CNC machined steel with two Torx head cap screws. The front ring has a machined dovetail that fits directly into the corresponding opening of a STD rail, while the rear ring is machined to lock in securely to the STD rail's windage screws. This system is easy to install, and provides a repeatable mounting solution that can be adapted to nearly any firearm.
This pair of Low STD extension rings place the centerline of the scope 0.65" above the top of the mounting base. They provide a 5/8" extension for shortening or lengthening the ring spacing.