A rare and hard-to-find Marlin aperture (peep) sight - the 12R. This one is in good overall shape, needs to be cleaned, but all the parts are there except the mounting screws (and those are standard threads, so you can get them anywhere) and there is no rust or pitting, only dried dirt and grease. Yes, I should have cleaned it, but if you\'re looking for one of these sights, you know what to look for.I don\'t need this one anymore and it doesn\'t need to sit in my shop - get it back to the range.

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