UTG MNT957 Accu-Sync Rear Sight Dual 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. Frame Material: Aluminum/Steel