Tacfire IS009: These incredible 45-degree iron sights are constructed of 6061-T6 Black anodized aircraft-grade aluminum for strength and durability. The front sight has an adjustable A2 post, and the rear sight features dual apertures for use in short and long-distance shooting. These sights would be a great choice if you would like to quickly transition from optics to iron sights by just canting your rifle to 45 degrees.