UTG Mt945 Accu-Sync 45 Degree Rear Picatinny/Weaver 1.7" High The UTG Accu-Sync 45-Degree Rear Sight Is Precision CNC-machined From 6061-T6 Aluminum And Steel With a Matte Black anodized Finish For Durability And Corrosion Resistance. Its 45 Angled Offset Design Allows Seamless Use Of Iron Sights Alongside Magnified Optics. The Dual-Aperture Rear Sight features a Tool-Free Windage Adjustment Wheel For Quick And Precise aiming. A Posi-Lock Retention Plunger ensures The Sight stays Securely In Place When deployed. For a Stable Zero Hold, It Mounts With a Single Locking Torx Screw And squared Recoil Stops On Picatinny Rails. Frame Material: Aluminum/Steel Style: Flip Up