Tactical Removable Rear Flip-up Iron Sight Complete With Dual Aiming Aperture by Sniper(R). SKU: MFLRS01Equipped with Locking Retention Thumb Nut. Precision Windage and Elevation Adjustments. The rear sight can fits high profile gas block or top rail with red laser and rear sight with the carry system to handle with front sight tool. A must-have item.* Black* Precision Machined Aluminum* Precision Windage and Elevation Adjustments* Thumb Nuts with Locking Retention for Maintaining Zero