Leupold STD Two-Piece base, Browning X-bolt

• Two-piece steel construction: The separate front and rear bases keep the mounting system compact and leave more access to the rifle’s action, while steel construction adds the rigidity needed for a secure scope-to-rifle connection.
• STD mounting interface: Built for the Leupold Standard (STD) system, this base works with the front dovetail and rear windage-adjustable ring arrangement that helps align the scope during installation.
• Browning X-Bolt fit: This model is made specifically for the Browning X-Bolt family, giving a correct receiver fit across the listed short, long, and magnum action variants.
• Made in USA: U.S. manufacturing supports consistent machining and finish quality, which matters on a mounting component that must hold alignment under recoil and regular field use.
• Low-profile base height: With a BH height of 4.00 mm, the base keeps the optic mounting platform close to the receiver, helping maintain a clean rifle setup and practical scope positioning.

About the STD Series

Leupold’s STD Series is the company’s long-established line of steel scope mounting systems for hunters and shooters who want a traditional, proven base-and-ring arrangement. In Leupold’s mount lineup, STD sits as a versatile option between simple fixed mounting and more specialized quick-detach or tactical rail systems. It is widely used on sporting rifles where a clean profile, dependable hold, and broad firearm compatibility matter more than added bulk.

A defining feature of the STD system is its front dovetail design paired with a rear ring secured by windage screws. In practice, this gives the installer some lateral adjustment while bore sighting, which can help center the scope more efficiently and preserve more of the optic’s internal adjustment range. The two-piece layout also keeps the ejection port more open than a one-piece base, which many hunters prefer on bolt-action rifles. Across the series, the emphasis is on durable steel construction, straightforward installation, and compatibility with multiple ring heights so the setup can be matched to different scope sizes and rifle applications.

About the Leupold STD Two-Piece base, Browning X-bolt

The Leupold STD Two-Piece base, Browning X-bolt is a rifle-specific mounting solution for shooters who want the familiar handling of the Browning X-Bolt combined with the flexibility of the Leupold Standard (STD) system. Because it is built as a two-piece base, it keeps the receiver area more open, which is useful on a hunting rifle where easy loading and unloading through the action is often preferred. The compact layout also helps maintain the streamlined look many X-Bolt owners want.

This model’s main advantage is how it works within the STD architecture. The front ring seats in a dovetail, while the rear ring uses windage screws for alignment. That arrangement gives practical installation benefits: it can help correct minor alignment issues at the mount level and reduce the need to use as much internal windage adjustment in the riflescope itself. For shooters setting up a general-purpose hunting rifle, that can make zeroing more straightforward and leave more adjustment available for distance work.

Steel construction gives the base the strength expected from a recoil-bearing component, and the 4.00 mm base height keeps the mounting platform low and tidy. This version is compatible with listed X-Bolt short action, long action, and magnum variants, making it a practical choice for standard sporting rifle configurations that use the Leupold STD ring system.

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 for hunting, shooting, and outdoor use. Its catalog spans riflescopes, red dot sights, binoculars, spotting scopes, rangefinders, and thermal optics, reflecting a broad specialization in field-ready optical equipment.

Leupold entered the riflescope market with the Plainsman in 1947, a step that helped define the company’s place in sporting optics. It later introduced the Duplex reticle in 1962, one of the most recognizable reticle designs in the category. The company moved its manufacturing plant and headquarters to Beaverton in 1968, and Leupold & Stevens, Inc. is headquartered in Beaverton, Oregon, United States. That long focus on optics and mounting solutions is directly relevant to products such as the STD base system.

Main Features

• Manufacturer: Leupold
• Made in: USA
• Material: Steel
• Base height: 4.00 mm
• Dimension A: 17.78 mm
• Dimension B: 71.74 mm / 74.74 mm / 93.84 mm
• Dimension C: 17.78 mm
• Compatibility: FN Browning X-Bolt SSA, FN Browning X-Bolt SA (71mm), FN Browning X-Bolt SA (74mm), FN Browning X-Bolt LA, FN Browning X-Bolt Magnum (MA)
• Mount standard: Leupold Standard (STD)

Warranty

Leupold provides a 10-year warranty for this mount base. That stated coverage period supports its role as a long-term steel mounting component for regular hunting and sporting rifle use.

In the Box

• Two-piece base set
• Base screws