Will the Lyman 57 GPR fit my older Lyman Great Plains Rifle manufactured before April 1997?

For Lyman Great Plains Rifles manufactured after April 1997, the sight is a direct fit utilizing the factory drilled and tapped tang. Rifles manufactured prior to April 1997 will require custom gunsmithing to drill and tap an 8-32 mounting hole to properly secure the wedge adapter.

What is the maximum effective shooting distance when paired with a traditional muzzleloader in the field?

The Lyman 57 GPR extends confident open-sight shooting out to 50 to 100 metres, making it ideal for traditional black powder hunting and SSAA target disciplines. For distances exceeding 100 to 150 metres, optical rifle scopes or Vernier long-range tang sights are better suited for precision work.

Does this peep sight come with different apertures for varying lighting conditions in the bush?

Yes, the unit includes two interchangeable screw-in aperture discs. You can use the small aperture for precision target shooting in bright light, and easily switch to the larger aperture for improved light gathering during low-light hunting, or remove the disc entirely for a ghost-ring setup in dense timber.

Do I need any electrical or compliance certifications to use this mechanical sight in Australia?

No electrical compliance is required. As a purely mechanical firearm accessory featuring a black anodized aluminum housing and blued steel click screws, it operates completely unpowered with zero electrical requirements or SAA/RCM certifications.

Muzzleloader Sight - Lyman LY-57GPR

The Lyman Receiver Sight 57 GPR (Model LY-57GPR / Lyman #3090112) is a mechanical, non-powered rear receiver peep sight engineered specifically for traditional black powder firearms. Designed as a direct-fit metallic aperture sight for the Lyman Great Plains Rifle (GPR) and Great Plains Hunter in both .50 and .54 calibre percussion and flintlock configurations, it replaces factory open buckhorn sights with an extended sight radius and repeatable micrometer adjustments. Constructed from a black anodized machined aluminium housing paired with blued steel internal click screws and detents, this non-magnified iron sight delivers a cleaner sight picture for game harvesting and paper target shooting out to 50 to 100+ metres.

Key Features

Audible Micrometer Adjustments: Features 1/4 MOA (1/4 minute) coin-slotted low-profile stayset click adjustments for independent windage and elevation tuning.
Dual Aperture Versatility: Includes two interchangeable screw-in aperture discs (a small aperture for target shooting depth-of-field and a large aperture for low-light hunting), which can also be fully unscrewed for a wide ghost-ring setup in dense timber.
Quick-Release Slide System: Integrated quick-release slide with a built-in elevation stop/preset screw allows shooters to detach the sight staff for firearm cleaning, transport, or storage and reinstall it without losing zero.
Dedicated Mounting Hardware: Includes the specific wedge adapter and mounting screws designed for tang mounting on post-April 1997 factory drilled and tapped Investarms and Lyman GPR platforms (pre-April 1997 rifles require drilling and tapping an 8-32 hole).
Fully Mechanical Reliability: Requires zero electrical power (0V / no batteries) and operates reliably across all-weather hunting conditions.

Product Specifications

Product Name: Lyman Receiver Sight 57 GPR
Part Number: LY-57GPR / Lyman #3090112
Sight Type: Tang-mount metallic receiver peep sight
Adjustment Value: 1/4 MOA audible clicks (windage and elevation)
Housing Material: Black anodized machined aluminium
Hardware Material: Blued steel click screws and detents
Weight: Approximately 0.27 lb (approx. 122 g shipping weight)
Apertures: 2 interchangeable screw-in discs (target and hunting/low-light)
Platform Compatibility: Lyman Great Plains Rifle and Great Plains Hunter (.50 and .54 calibre; does not fit Deerstalker or Trade Rifle rounded-breech models)

Who is the Lyman Receiver Sight 57 GPR for?

Traditional Muzzleloader Hunters — Equips Lyman Great Plains rifle hunters with a rugged ~0.27 lb metallic receiver peep sight that provides 1/4 MOA adjustment clicks and interchangeable hunting discs for clear low-light target acquisition without using non-compliant magnified optics.
SSAA Black Powder Target Shooters — Provides competitive black powder target shooters with precise 1/4 MOA audible micrometer elevation and windage increments in a lightweight ~0.27 lb muzzleloader receiver peep sight system to tighten groupings over standard factory buckhorn sights.

Less suitable for: Long-range precision shooting at distances exceeding 100–150 metres, where optical rifle scopes or Vernier long-range tang sights are better suited.

SKU	LY39894LP
Model #	LY-57GPR
Brand	Lyman
Shipping Weight	1.0000kg

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Lyman Ly-57gpr Receiver Sight Micrometer Adjustments Black Aluminum

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