Viridian 9820027 RFX45 Docter Mounting Adapter Black Anodized
http://www.tandktactical.com/shop/754003936445-viridian-9820027-rfx45-docter-mounting-adapter-black-anodized-36672
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Docter Adapter Plate for RFX45 Closed Emitter Green Dot Sight.
