The UTG ACCU-SYNC Rear Sight is a spring-loaded flip-up rear sight designed for Picatinny rails. It features a dual aperture design with tool-free windage adjustments for easy customization. The sight has a Posi-lock push button that automatically deploys the sight and prevents it from collapsing once it is deployed, ensuring secure and reliable use during shooting. Constructed from CNC-machined 6061-T6 aluminum and steel, the sight is finished with a matte black anodize, providing durability and resistance to wear. It features a single locking Torx screw and squared recoil stops for a secure zero hold and return to zero after removal. The fold-over design minimizes rail space usage, with a low-profile 0.63" stowed height, making it lightweight at just 1.4 oz. This rear sight is ideal for use alongside the matching UTG ACCU-SYNC Front Sight for a complete sighting solution that is designed to stay on the same level plane for improved accuracy. It&';s a compact and efficient sight for tactical and competitive shooting.