High Profile Flip Up Front Sight in stock Spear goggles comply with harsh Kleur:Everglade Spear goggles comply with harsh protection norms while having a mix of modern and tactical looks and being NVG ready Weight: 640 g Shipping weight: 660 g Information from producer (extern) Leapers vision for the U Quick detachable front sight with adjustable A2 square post assembly to fit all Picatinny Weaver style rails Equipped with locking retention thumb nut andclever and robust flip up posi lock design to guarantee zero in the most extreme combat condition Precision elevation adjustments to enhance shooting accuracy Profile designed for installation on gas block