The17 Hornady Magnum Rimfire (HMR) Diode Module inserts into the chamber for adjustment of sights at 25 yards in order to get the firearm "on paper" to save both time and ammunition when sighting in. The Diode Module includes LR41 "button-type" battery cells and a foam lined storage case.
Purchase Sight Arbors separately by caliber.
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*The image and details above are a representation only, production variances may exist. For details please contact us or the manufacturer prior to ordering.