Magpul MBUS Pro LR Rear Adjustable Sight - Black - The new MBUS Pro LR capitalizes on the low profile and sleek styling of the original MBUS Pro, while adding the additional feature of an elevation adjustment wheel to accurately engage targets at variable distances. With its all steel construction, this is the sighting solution that delivers no-tool adjustments, maximum strength, corrosion resistance, and functionality in a compact package. Positive detents keep the MBUS Pro LR at standard AR sight height when deployed and so low when stowed that you will hardly notice them. All Steel Construction Windage Adjustable With Low-Profile Knob Positive Detents In Both The Up And Down Positions Elevation Adjustment Wheel For 200-600 Meter Distances Made in the USA