DLP Tactical HK416 Style Metal Front & Rear BUIS Iron Sight Set Affordable yet rugged HK 416 Style BUIS sight set, mounts to any standard Picatinny Rail Constructed of Forged T-6061 Aluminum Alloy, can be installed directly on gas blocks and will not melt like Polymer Folding sights Windage adjustable rear sight has HK style diopter sight drum with four selectable apertures Elevation adjustable front sight has interchangeable sight post Proudly made by DLP Tactical