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Holosun 507KThe Holosun 507K is a compact, open reflex sight designed for use on firearms. It is a newer addition to Holosun's lineup of optics and has quickly gained a reputation for being a reliable and feature-rich sight.One of the standout features of the Holosun 507K is its size. It is one of the smallest open reflex sights on the market, making it a great option for use on compact firearms or for use as a backup sight. Despite its small size, it still offers a large field of view and a cle …