Peep Rear Sight, adjustable, to fit Lyman Great Plains rifle

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Peep Rear Sight, adjustable,
to fit Lyman Great Plains rifle

Part Number:	RS-57-GPR
Availability:
Price:	$116.99
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Blued steel, with two eye disks, adapter plate allows easily installation on Lyman Great Plains rifles. Two mounting screws included. Features 1/4 minute micrometer click adjustments for elevation and windage, quick release slide. The larger 5/8" diameter knurled eye disk is drilled with the smaller .040" aperture for use on bright days. The smaller 1/2" diameter knurled disk is drilled with a larger .093" aperture for large field of view and quick target acquisition on cloudy days. Made in the U.S.A. by Lyman, this sight is a favorite of target shooters. Both large and small eye disks are included (small disk shown). A third choice is to use this sight with no eye disk installed, for quick sighting in dark woods or dark days.

Invest Arms produced Lyman Great Plains rifles made before April 1997 will require drilling and tapping an 8-32 hole. Invest Arms Lyman Great Plains rifles made after April 1997 will have a factory drilled and tapped hole on the tang. The Davide Pedersoli Lyman Great Plains Signature Series rifles introduced in 2020 will accept this sight, the sights do not currently come supplied with screws to secure the base to the Pedersoli produced rifles.

Shown with the 1/2" disk installed. Replacement disks are available at extra cost.
Re-order large 5/8" disk with small .040" aperture #RS-57-DISK-2S
Re-order small 1/2" disk with large .093" aperture #RS-57-DISK-2L
Disks have special 7/32-40 thread to fit Lyman and some other sights.

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lyman-57&66-sight-instructions.pdf Last updated:6/17/2015 (68 KB)

page_245.pdf Last updated:4/25/2012 (145 KB)

drill bit, HSS, Number 29, .1360" diameter, tap drill for 8-32 thread

Part Number:	DRILL-29
Availability:
Price:	$2.19
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Aperture disk, large, 1/2" diameter, .093" aperture, fits Lyman RS-57-SML or RS-57-GPR sight

Part Number:	RS-57-DISK-2L
Availability:
Price:	$9.99
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Aperture disk. Small .040" aperature in large 5/8" disk fits RS57SML or RS57GPR. Special 7/32-40 thread .

Part Number:	RS-57-DISK-2S
Availability:
Price:	$9.99
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Tap, high carbon steel, 8-32 thread, taper tap

Part Number:	TAP-8-32-T
Availability:
Price:	$3.99
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