Will the Lyman 66LA fit my Marlin lever-action without requiring a gunsmith?

The Lyman 66LA mounts directly to the left flat side of the receiver using two included #6-48 screws. Older Marlin models feature factory-drilled and tapped holes for straightforward screw-on installation, though later models or modern Ruger-made Marlins lacking these pre-drilled holes will require a gunsmith to drill and tap the receiver.

How precise are the adjustments on the Lyman 66LA receiver sight?

This sight features audible 1/4 MOA click micrometer adjustments for both windage and elevation, allowing for precise zeroing in the field. The elevation plate provides a total vertical adjustment range of 45 MOA, and the unit comes equipped with coin-slotted stayset steel knobs to securely lock your zero against field snagging and heavy recoil.

How does the Lyman 66LA perform in low-light outback hunting conditions?

The fully mechanical sight is supplied with two interchangeable 1/2-inch aperture discs, including a large-diameter disc designed specifically for quick target acquisition during bush hunting. However, because it is an unpowered aperture sight relying on human visual acuity, it is optimized for daylight brush distances out to 150 metres and is not recommended for low-light dawn or dusk scenarios where a magnified scope or illuminated red dot is needed.

Are there any electrical compliance requirements for the Lyman 66LA in Australia?

No, electrical certifications such as 240V mains power, Australian AC plugs, and ERAC/RCM/SAA approvals do not apply to this product. The Lyman 66LA is a 100% mechanical, unpowered sighting device with zero electrical components, making it fully compliant for unhindered outback and bush use.

Marlin Receiver Sight - Lyman LY-66LA

The Lyman 66LA Receiver Peep Sight provides fully mechanical aperture sighting for flat-sided Marlin lever-action rifles, including models 336, 1894, and 1895. Designed as a lightweight sighting solution that avoids the bulk of telescopic optics, it weighs approximately 4 oz (~113.4 g) and mounts to the side of the receiver using two included #6-48 mounting screws. The sight operates mechanically without batteries and withstands recoil from calibres ranging from .357 Magnum and .30-30 Winchester up to heavy .45-70 Government loads.

Key Features

Micrometer Adjustments: Features audible 1/4 MOA click micrometer adjustments for both elevation and windage.
Elevation Travel: Includes an elevation plate graduated in 15-minute increments offering up to 45 MOA of total vertical adjustment.
Dual Aperture Discs: Supplied with two interchangeable 1/2" diameter screw-in aperture discs, including a large aperture for fast field acquisition and a small pinhole aperture for fine target shooting.
Quick-Release Elevation Slide: Incorporates a push-button release slide for rapid removal and cleaning, secured with coin-slotted stayset steel knobs to prevent zero drift from field snagging.
Mounting Hardware: Attaches directly to factory pre-drilled and tapped receiver holes on compatible Marlin models using supplied #6-48 screws.

Specifications

Product Model: Lyman 66LA (MPN: 3662215)
Firearm Compatibility: Marlin Models 336, 1894, 1895 (flat-sided receiver models)
Mounting Interface: Receiver side-mount (#6-48 screws included)
Weight: Approx. 4 oz (~113.4 g)
Adjustment Value: 1/4 MOA per click (windage and elevation)
Elevation Range: Up to 45 MOA (graduated at 0, 15, 30, and 45 MOA)
Aperture Disc Diameter: Standard 1/2" diameter threading
Power Requirements: None (0W, fully mechanical)

Who is the Lyman Receiver Peep Sight Marlin 336, 1894, 1895 for?

Bush hunters — provides rapid target acquisition on deer-sized game across brush distances of 15 m to 150 m without the bulk of glass optics by utilising a large 1/2" diameter aperture disc and a minimal 4 oz installed weight.
Cowboy Action and metallic silhouette competitors — delivers precise shot placement on Marlin lever-action rifles via audible 1/4 MOA click micrometer adjustments and a visual elevation scale covering up to 45 MOA of adjustment.

Less suitable for: Target engagements beyond 150 to 200 m or low-light dawn and dusk conditions where natural visual acuity through an unmagnified peep sight is limited; these scenarios require a magnified riflescope or an illuminated red dot sight. It is also less suitable for shooters with severe astigmatism or presbyopia, who benefit more from an optic with an adjustable diopter.

SKU	LY39900LP
Model #	LY-66LA
Brand	Lyman
Shipping Weight	0.5000kg

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Lyman Ly-66la Receiver Peep Sight Marlin 336 1894 1895 Micrometer

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