The UTG Accu-Sync Spring Loaded AR-15 Flip Up Rear Sight provides the shooter with a spring loaded backup sight that can be quickly deployed and used on a firearm with a primary magnified optic. The Posi-lock Retention device prevents the sight from collapsing when in use. The integrated Windage Adjustment Wheel allows for tool-free sight post adjustment. Attaches to a Picatinny rail with a single locking Torx screw. Precision machined from aircraft aluminum and given a Mattee Black finish.