The Spike's Tactical Rear Folding Micro Sight (Gen2) is an extremely lightweight back-up sight with a compact and low profile design. Made from billet aluminum and anodized with a Mil-Spec Type-III Hardcoat black finish. The rear sight has windage adjustments and quick settings for 100, 200, 300, 400, 500, and 600 meters. The rear sight also has a removable aperture for CQB use. Lifetime warranty and made in the USA.