ThisVortex CrossFire II 6-24x50 AO riflescope with a Dead-Hold BDC Reticle (MOA) reticle is waterproof/fogproof and has a long eye relief, fast-focus eyepiece, multi-coated lenses, resettable MOA turrets, and a hard anodized aircraft-grade aluminum tube that is nitrogen purged and o-ring sealed.