Lyman Receiver Sight 57 SME (LY-57SME)

The Lyman Receiver Sight 57 SME is a high-precision micrometer aperture receiver "peep" sight designed for classic rounded bolt-action rifles. Constructed from lightweight, high-strength aluminum and finished with a durable blueing, this receiver sight provides shooters with a reliable, mechanical sighting system. It mounts securely using standard #6-48 attaching screws, delivering precise alignment and robust performance under diverse field and range conditions.

Key Features

• Micrometer Precision: Features 1/4 minute of angle (MOA) audible click adjustments for both windage and elevation, allowing for highly accurate and repeatable zeroing.
• Quick-Release Slide: Equipped with a push-button quick-release mechanism that allows the entire slide assembly to be detached instantly for transport, cleaning, or storage.
• Stayset Adjustment Knobs: Low-profile, coin-slotted "Stayset" knobs prevent accidental adjustments while navigating dense brush or during transport.
• Dual-Purpose Apertures: Supplied with two interchangeable screw-in aperture discs, including a large 1/2-inch outer diameter hunting disc with a 0.090-inch hole for rapid target acquisition, and a smaller target disc for enhanced depth of field.
• Rugged Construction: Manufactured from high-strength aluminum to keep weight minimal while maintaining structural integrity and resistance to heavy recoil.

Technical Specifications and Compatibility

• Manufacturer Part Number: LY-57SME (3572087)
• Adjustment Graduations: 1/4 MOA audible clicks
• Aperture Options: 1/2-inch hunting disc (0.090-inch aperture) and small target disc
• Mounting Hardware Required: Two #6-48 screws
• Mauser Compatibility: Models 1891, 1893, 1895, 1896, 1898, 1904, 1909, 1936, and G33/40
• Springfield Compatibility: Models 1903, M1, and M2 (.22 Cal)
• Enfield Compatibility: Models 1914 and 1917 (requires rear receiver bridge to be re-contoured)
• Other Action Compatibility: Japanese Arisaka (6.5mm and 7.7mm), Coltsman Sako, and Browning Sako
• Australian Installation Note: Many military-profile receivers, including surplus Mauser 98 and Enfield rifles popular in Australia, require professional gunsmithing. This includes milling, re-profiling the receiver bridge, drilling, and tapping to ensure correct installation.
• Electrical Compliance: This is a purely mechanical firearm accessory. It contains no electronic components and does not require Australian SAA or RCM electrical safety certifications.

Who It Is For

The Lyman 57 SME is designed for vintage rifle enthusiasts, competitive target shooters, and hunters who value the precision of traditional iron sights over modern optical scopes. It is highly suited for Australian shooters participating in vintage military service rifle competitions or those restoring classic bolt-action rifles. Whether you are aiming to squeeze the maximum accuracy out of a surplus Mauser on the range or seeking a reliable, scope-free sighting system for hunting in thick scrub, this micrometer receiver sight provides the repeatability and durability required for consistent performance.