Viridian 981-0128 MDS35 Black Anodized 1 x 36 mm 3 MOA Green Dot
http://www.tandktactical.com/shop/785034179808-viridian-981-0128-mds35-black-anodized-1-x-36-mm-3-moa-green-dot-40571
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MSD35 Modern Dot Sight. 3 MOA Green Dot. IPX6 waterproof.