Airsoft AEG Shooting Gear D-Boys Knight's KAC Type 600M Flip Up Rear Sight Black Suitable for all M4/M16 & AR-Series with standard 20mm RIS/RAS rail. Special design locking system ensures the sight will remain up and zeroed in the most extreme combat conditions. Windage and elevation adjustment by 2 screw dials. Weight - Approx 100g Go to the middle left of the page to see the full Product Description.