Leupold STD Two-Piece base, STD Ruger American RF

• Two-piece steel base set: The separate front and rear bases keep the mounting layout simple and strong, giving a solid platform for a riflescope without adding unnecessary bulk to a rimfire rifle.
• STD mounting interface: Built for the Leupold Standard (STD) system, this base works with the front dovetail and rear windage-screw arrangement that allows lateral alignment during bore sighting.
• Rifle-specific fit: This model is made for the Ruger American Rimfire, which helps ensure proper receiver fit and scope positioning for a clean, dependable installation.
• Matte black steel construction: The steel build adds rigidity and long-term wear resistance, while the matte finish keeps reflections low and matches practical hunting rifle setups.
• Made in the USA: Domestic manufacture reflects Leupold’s long-standing focus on durable shooting equipment and gives this base the kind of build quality expected for regular field use.

About the Leupold STD Bases Series

Leupold STD Bases are a traditional hunting-style mounting system built for shooters who want a proven, mechanical scope-mounting layout rather than a bulkier tactical rail. The series includes steel bases in both one-piece and two-piece configurations, with each model shaped for a specific rifle action so fit is tailored to the firearm rather than generic. That model-specific approach has made the STD family a long-running choice for bolt-action and rimfire rifles used in hunting and general field shooting.

A defining feature of the series is the front dovetail ring interface combined with rear windage screws. In practice, this allows lateral adjustment during bore sighting and helps center the scope more precisely in the mount. That can preserve more of the riflescope’s internal adjustment range for zeroing or ballistic dialing. Across the range, Leupold has offered STD bases in finishes such as matte, gloss, and silver, and some variants remain in the catalog while others have been discontinued. The result is a mounting family that stays relevant because it balances traditional form, practical adjustability, and durable steel construction.

About the Leupold STD Two-Piece base, STD Ruger American RF

The Leupold STD Two-Piece base, STD Ruger American RF is a rifle-specific base set made for the Ruger American Rimfire and designed around the established Leupold Standard (STD) mounting system. Its two-piece layout leaves the receiver area more open than a full-length base, which suits compact rimfire rifles and keeps the setup clean and uncluttered. For shooters building a practical hunting or small-game rifle, that means secure scope support without adding the visual or physical bulk of a rail-style mount.

The base is made from steel, a material chosen for rigidity and long-term resistance to wear at the mounting interface. In use, that matters because the base is the foundation of the optic system: a stable mount helps the riflescope hold zero and stand up to repeated handling, transport, and field conditions. The matte black finish keeps reflections subdued and pairs well with modern rimfire rifles and matte-finished optics.

What makes this model especially practical is its compatibility with the STD front dovetail and rear windage-screw arrangement. That design gives the installer some lateral adjustment while bore sighting, which can help align the scope more efficiently and reduce unnecessary use of internal windage correction. For a rimfire setup intended for target shooting, pest control, or general hunting use, this base delivers a straightforward combination of correct fit, durable construction, and a mounting system that has remained popular because it is simple to service and dependable in everyday use.

About Leupold

Leupold & Volpel was founded in Portland, Oregon, in 1907 by Fred Leupold and Adam Volpel. The company remains family-owned and focuses on sport optics and related shooting equipment for hunting, shooting, and outdoor use. Its product range includes riflescopes, red dot sights, binoculars, spotting scopes, rangefinders, and thermal optics, giving the brand a broad presence across both sporting and field applications.

Leupold entered the riflescope market with the Plainsman in 1947 and later introduced the Duplex reticle in 1962, two milestones that helped establish its reputation in American sporting optics. In 1968, the company moved its manufacturing plant and headquarters to Beaverton, Oregon, where Leupold & Stevens, Inc. is still headquartered. Alongside well-known hunting-focused VX-series optics, Leupold also produces Mark-series riflescopes for tactical use, reflecting long experience in building equipment for both field and precision shooting.

Main Features

• Manufacturer: Leupold
• Mount Series: Leupold STD Bases
• Made in: USA
• Material: Steel
• Color: Black - Matte
• Base Configuration: 2 Piece
• Weight: 3.2 oz
• Base Cant: No
• Base/Receiver Screw Torque: 22 in-lbs
• Windage Screw Torque: 45 in-lbs
• Compatibility: Ruger American Rimfire
• Mount Interface: Leupold Standard (STD)

Warranty

Leupold provides a 10-year warranty for this mount base. That stated term adds clear long-term support for a component that is expected to remain secure and serviceable through regular rifle use.