Scalarworks Peak Iron Sights are for shooters who want the familiarity of classic AR-15 fixed sights, with upgrades to make them more suitable for modern tactical carbines. The Scalarworks crew designed the Peaks for a 15" sight radius, making them far more suitable for AR-15 carbine use than old "A2" sights designed for an M16A2 rifle’s 20" radius. Peak Iron sights are manually adjustable for elevation (front) and windage (rear) in 1/2 MOA clicks. The front sight post is machined to the correct width for the 15" sight radius and its flat-face eliminates highlight bias. The rear sight’s peep presents a flat surface to the shooter as well to prevent distorting shadows and/or glare caused by the mil-spec A2 peep’s concave rear face. Machined 7075 T6 aluminum - far stronger than standard 6061 alloy Black Mil-A-8625 Type III hardcoat anodized 4140H steel hardware with Black Nitride finish 36mm (1.42") height over rail Front post: 1.35mm wide Rear flip apertures: 1.78mm (.07") and 5.08mm (.20") As a bonus, Peak Fixed Sights are designed to sit 36mm above the rail, making them ideal as backup sights for an Aimpoint optic mounted on a Scalarworks Leap Mount (available separately). Mount a set on your carbine and see just how effective iron sights can be!