The Co-witness Notch/Peep AR-15 rear sight from Weapon Solutions is designed to prevent the top of the peep from covering up red dot-type optics during co-witness sighting with the AR-15 rifle. This CNC machined 6061-aluminum replacement notch and peep sight allows the shooter to see the entire sight picture needed to co-witness on a target. In addition to holographic and red dot sighting systems, it also may be used with tritium or fiber optic front sights. It replaces the standard flip A2 or A1 adjustable sight with no modifications.