Firefield FF26021K 26021K: Firefield\'s Impact Mini Reflex Sight packs a big red-dot performance into a small, ruggedly reliable optic. The Impact has an illuminated 5-MOA reticle and five brightness settings. The mission-driven shockproof sight boasts advanced scratch-resistant, anti-reflective AR-red coated glass, infinite eye relief with a 50-yd parallax setting. It mounts easily on a Weaver and Picatinny rail and is operated on a CR1632 battery. This reflex sight kit includes low profile, co-witness, and 45 dgree mounts, cover, CR1632 battery, and adjustment tools.