In studying Britishicon/European target rifles, it seems like it was common to add aftermarket doodads for an extra little bit of advantage, like adjustable-aperture eyepieces or color/polarizing filters on micrometer rear sights, or magnifying lenses inside tunnel sights.

I've never heard of anything like that being used with target '03s. Did similar add-on bits exist back in the day, like an adjustable-aperture or filter eyepiece for a Lyman 48?
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