Pro Mag Flip Up Ranging Rear Sight M16/AR-15

Low profile rear sight attaches to AR-15 / M16 flat top A3 upper receivers. Used as a back-up sight or as co-witness with red dot or holographic sights. One click allows 0.55 MOA (minute of angle) change on rifles and 0.65 MOA change on carbines. Constructed of black phosphated steel alloy and type III black anodized T6 aircraft grade aluminum. Precision machined to fit AR-15 / M16 flat top A3 upper receiver rifles and carbines. Mounts to the rail via a locking bar and secured with a cross slotted, knurled thumb screw. No permanent modification required for installation. All hardware is included.