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Marbles 1/4" tang sight aperture
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Marbles replacement 1/4" aperture (old style Marble's tang sight).
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Marbles 3/8" tang sight aperture
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This is a 3/8" replacement aperture for the old style Marble's tang sight.
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Marbles 5/8" tang sight aperture
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This is a 5/8" replacement aperture for the old style Marble's tang sight.
