The UTG Accu-Sync Spring Loaded AR-15 Flip Up Front 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. Uses standard A2 front sight posts and is interchangeable with other aftermarket posts. Attaches to a Picatinny rail with a single locking Torx screw. Precision machined from aircraft aluminum and given a Mattee Black finish.