Lyman 66 Receiver Peep Sights

• Receiver-mounted peep design: Places the aperture close to the shooter’s eye for a cleaner sight picture and faster alignment than many barrel-mounted rear sights, which helps practical field accuracy.
• 1/4 minute click adjustments: Audible micrometer clicks for elevation and windage make it easier to move point of impact in small, repeatable steps when zeroing a hunting rifle or utility lever gun.
• Quick-release slide: The slide can be removed quickly, which simplifies transport, storage, or switching sight setups without losing the basic receiver-mounted arrangement.
• Two interchangeable aperture discs: A larger hunting aperture supports quicker target acquisition in changing light, while the smaller target aperture gives a more precise sight picture for deliberate shooting.
• Steel construction: The steel body gives the sight the rigidity and wear resistance expected for a working rifle sight that may see regular field use.

About the 66 Series

The Lyman 66 Series is a long-running family of receiver peep sights built for shooters who want a practical upgrade from standard open rear sights without moving to an optical sight. In Lyman’s lineup, the series sits as a traditional iron-sight solution for lever-action rifles and other firearms with suitable flat receivers. Its purpose is straightforward: provide a more precise and more repeatable aiming system while keeping the rifle trim, simple, and well balanced.

Across the range, the defining features are micrometer-style windage and elevation adjustment, a receiver-mounted aperture, and a design intended for real use rather than bench-only shooting. The aperture arrangement naturally centers the front sight in the shooter’s vision, which can make aiming feel faster and less cluttered than with a conventional notch rear sight. Lyman also equips the 66 pattern with practical details such as a quick-release slide and interchangeable discs, so the sight can adapt to both hunting and more deliberate target work. The result is a compact, durable sight family that suits shooters who value traditional handling, dependable adjustment, and the clean sight picture that made receiver sights a lasting choice on classic American rifles.

About the Lyman 66 Receiver Peep Sights

The Lyman 66 Receiver Peep Sights are designed for shooters who want to improve the precision of a traditional rifle while keeping the speed and simplicity of iron sights. This model family is intended for flat-receiver rifles, especially classic lever-action platforms, and the listed fitments cover versions for the Winchester 94, Marlin 336, 1894 and 1895, Marlin 39A, and Winchester 1886. That makes the 66 a practical choice for hunters, woods rifles, and traditional sporting setups where compact handling matters.

Its main advantage is the receiver-mounted aperture itself. Because the peep sits closer to the eye than a barrel-mounted rear sight, the front sight tends to stand out more clearly and alignment becomes more intuitive. In practice, that helps many shooters hold more consistently and shoot more accurately, especially on rifles carried for fast shots at ordinary field distances. The 1/4 minute audible click micrometer adjustments add another important benefit: zeroing is controlled and repeatable rather than approximate. Small changes in elevation or windage can be made with confidence, which is useful when refining a hunting zero or matching the sight to a preferred load.

Lyman also gives the 66 a distinctly practical layout. The quick-release slide simplifies handling and removal, while the coin-slotted stay-set knobs are easy to manage without specialized tools. Two aperture discs are included: a larger hunting disc for quicker sight acquisition and a smaller target disc for a finer aiming reference. Combined with the steel construction and adjustable design, these features make the 66 a capable rear sight for shooters who prefer traditional rifle sights with more precision than standard open irons.

About Lyman

The Lyman Gun Sight Company began in 1878 in Middlefield, Connecticut, and the brand remains closely associated with traditional sighting systems as well as shooting and reloading equipment. Today, Lyman Products is headquartered in Middletown, Connecticut and makes a broad range of products for shooters, including gun sights, reloading dies, presses, and bullet-casting equipment. That mix of product categories reflects a company with deep roots in practical shooting hardware rather than a narrow focus on one accessory type.

Within the sight category, Lyman is especially notable for the continuity of its classic designs. Lyman’s tang and receiver sights still use principles from William Lyman’s original sight design, which helps explain why products such as the 66 series remain relevant on traditional rifles. Over time the company also expanded its broader shooting portfolio, including the acquisition of the Ideal reloading-tool business in 1925 and the addition of later brands such as Pachmayr.

Main Features

• Manufacturer: Lyman
• Made in: USA
• Material: Steel
• Adjustment: Adjustable
• Front sight: No front sight
• Color: Black
• Weight: 120.00 g

Warranty

2 years. Lyman states a 2-year warranty for this product, giving defined coverage for defects in materials and workmanship within the stated period.

In the Box

• Lyman 66 receiver peep sight
• Large hunting aperture disc
• Small target aperture disc