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With the new HS403GL, Holosun has updated the design of the successful HS403G. As before, the battery is housed in a low profile compartment. The elevation and windage turrets are now low profile like the other sights in the Holosun line. This provides very little obstruction when aiming, especially with both eyes open. The mount is fully compatible industry standard mounts including aftermarket mounts. Features of PARALOW HS403GL Red Dot Sight : Low profile turrets Second generation motion sensor Front Lens is angled to prevent glare 2 MOA dot size Waterproof rating of IP67 Unlimited field of view Parallax-free with unlimited eye relief Unaffected by extreme weather conditions Durable and reliable construction Lowest profile emitter on the market Push button brightness setting Auto shutoff after 8 hours Auto awake to medium setting with movement Includes integrated industry standard low profile and 1/3 co-witness mounts Weight: 114g (4.0 oz) with the low profile mount and the battery Working temperature: -10 °C to 50 °C (14 °F to 122 °F) Storage temperature: -40 °C to 70 °C (-40°F to 158°F) Objective diameter: 20 mm (glass), 28 mm (ring) Limited Lifetime Warranty