Zero in with confidence with help from the Vortex Defender-XL 8 MOA Red Dot Sight. The fully multicoated lenses with an aspherical optical system and a large viewing window offer clear viewing, while 7075 aluminum construction with ShockShield technology provides waterproof and shockproof protection. Vortex Defender-XL 8 MOA Red Dot Sight - Scopes at Academy Sports