ACCU-SYNC spring-loaded flip-up front sight by Leapers, Inc. / UTG designed for the AR15 platform. Precision machined from aircraft aluminum with a matte black finish. Spring-loaded posi-lock push button activation automatically deploys sight tower and prevents sight tower from collapsing when deployed. Uses standard A2 front sight post, interchangeable with other aftermarket posts with equivalent dimensions. Utilizes a single locking torx screw with low profile mounting base and square-shaped integral recoil stops for a secure zero hold and return to zero on MIL-STD-1913 picatinny rails.