Daniel Defense is proud to announce the release of our Fixed Back Up Iron Sight. The lightweight, streamlined design makes it the optimum back up iron sight for shooters using today’s most popular reflex optics. Its well thought out design does not impede the use of the charging handle on M4 type rifles. The one piece design makes it easy to install to any Military Specification flattop upper receiver and the sight is secured to the upper using a slotted fastener which is threaded into a self locking steel thread insert. Machined from 6061 aircraft grade aluminum and Military Specification Hard Coat Anodized, our Fixed Back Up Iron Sight is both lightweight and durable. Features * One Piece Streamline Design * A1 Sight Adjustment * A2 Aperature * Slotted Screws Attachment * Light weight Materials & Construction Precision CNC machined from Aircraft Grade 6061-T6 Aluminum and Military Specification Type III Hard Coat Anodized for a rock hard lasting finish. The A1.5 Fixed Back up Iron Sight weighs only 1.7 Ounces. * Aircraft Grade 6061-T6 Aluminum * Military Specification Type III Hard Coat Anodized * 1.7 Ounces! * Made in the USA!