The Daniel Defense 1 O'clock Offset Rail is optimized for mounting miniature red dot optics in the 1 O'clock (right-hand) or 11 O'clock (left-hand) positions for quick, non-magnified, transitions when employing magnified primary optics on tactical hunting rifles with MIL-STD-1913 rails. The geometry allows for zero cheek-weld shift during the transition. This facilitates very fast transitions from magnified to non-magnified optics, and back. The 1 O'clock Offset Rail can also be used to mount a variety of lights or other accessories that mount to a MIL-STD-1913 rail. By flipping the part upside-down, one can mount a light in a good position for use with a vertical foregrip. Updated for 2014, the 1 O'Clock Offset Rail now utilizes our patented Rock and LockTM one piece mounting system, creating an even more robust and streamlined mounting surface as well as simplified installation on any MIL-STD-1913 picatinny rail. All Daniel Defense Rails are built to the 1913 Military Specification and are 100% Quality Assurance checked for conformity to the specification. Machined from 6061 aircraft grade aluminum and Military Specification Hard Coat Anodized, our Fixed Back Up Iron Sight is both lightweight and durable..