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I also enjoyed excellent performance from a Model 57 SML Lyman rear peep sight mounted on a .54 Lyman Deerstalker side hammer rifle with a Lyman ivory bead. Features on these sights include 1/4 minute audible click micrometer adjustments for elevation and windage, quick-release slide, coin-slotted "stay set" knobs and two interchangeable. $90.00 SKU 3090114 Quantity Out of Stock Description The Lyman® 57 SML Receiver Sight is rugged and precise with minimal protrusion, machined to hug your receiver for the lowest line of sight. Adjustable aperture affords a large field of view and quick target acquisition. This is a nice Lyman 57 SML Tang Peep Sight for a T/C Thompson Center Hawken or Renegade and will fit many other brands of black powder muzzleloader rifles. This happened to come off of an Investarms Italy Hawken. It comes with the mounting screw and is in nice used condition. You are buying this as is.