Daniel Defense Rail-Mount Fixed Front Sight The lightweight, streamlined design makes it unobtrusive and snag-free. The one piece design makes it easy to install on any MIL-STD-1913 rail and it secures with a slotted fastener threaded into a self-locking stainless steel thread insert. Special attention was paid to facilitate the use of compact weapon-lights forward of the sight, such as the X300, TLR-1, etc. The concave radius on either side of the sight is a great place to rest your thumb for easy, ambidextrous activation of the light. Machined from 6061-T6 aluminum and military spec hard anodized, this Rail-Mount Fixed Front Sight is both lightweight and durable and is the perfect complement to Daniel Defense's A1.5 Fixed Rear Sight. Features One Piece Streamline Design Uses Standard AR15 Apertures Easy to use in conjunction with compact, pistol-type weapon lights 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 Rail-Mount Fixed Front Sight weighs only 1.1 Ounces. Aircraft Grade 6061-T6 Aluminum Military Specification Type III Hard Coat Anodized 1.1 Ounces! Made in the USA!