Diamondhead FRONT & REAR Combat Sights - Integrated Sighting System (I.S.S.) w/Diamond (Color - Flat Dark Earth) (Sold as Set) (Flip-Up) Flips up quickly and smoothly for rapid deployment Folds down fast with the push of a button Proprietary deployment system ensures sight stays up securely & remains zeroed in combat situations Mil. Spec. Type III hard coat anodized 6061 T6 aircraft aluminum, finished in Black or Flat Dark Earth (FDE) Easy installation with proprietary clamping system, providing secure attachment to all Mil. Std. 1913 Picatinny Rails