Feature A The Lightest Full Metal Pistol Red Dot Sight in the World Only 19.1g (0.67oz) A 3MOA Dot Size, Slim & Low Profile, Snag-Free Design, Gold Plated Finish A Automatic Light Sensor, MAG Footprint Compatible for RMSc Footprint A Standard Window Size 17x24mm 0.7x0.9", 1" 25.4mm Width, 24mm / 0.9" Height A >50,000 Hours Battery Runtime for Weakest Visible Dot, IPX6 Water Proof A (the sight does NOT come with a weaver mount base) Specification Specification Details Magnification: N/A Window Lens Size: 17x24 mm Parallax: Free ( 45 MOA Windage Adjustment Range: >45 MOA Footprint: MAG (RMSc) Mounting Rail: N/A Illumination Setting: N/A Battery Type (Not Include): CR2032 Battery Life: Up to 50,000 hours Waterproof: IPX6 Shockproof: 1000 G Working Temperature: -20~+55Adeg C Housing Material: 6061-T6 Aluminum Alloy Mount Material: N/A Finish: Gold Plated Weight (Net): 19.1 g / 0.67 oz Items in the Package: Retail Package, Rubber Lens Cover, Hex Keys, Screws and Cleaning Cloth, etc Size Footprint