Slim and low profile design takes little rail space Compatible with 20mm picatinny rails Easy push button spring loaded flip-up rear sight Firmly locks into position as soon as it's raised Black full metal body construction Design enables the use of optics when necessary Assist in quick target acquisition close to mid-range Fully adjustable for windage and elevation In the Box 1X Rear Sight Specifications: Brand JG Build Metal Alloy Function Flip-Up Rear Sight Compatibility 20mm Picatinny Rails Color BLACK California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov