MINOX ZA 5 4-20x50 Riflescope BDC Reticle High-power riflescope with 4-20x magnification and 50mm objective lens Schott lens system delivers superior contrast and brightness at any time of day Purged with argon gas to prevent fogging and corrosion; 100-percent waterproof Aircraft-grade anodized-aluminum housing; Minox BDC reticle 1-inch monotube construction for easy, low-profile mounting; weighs 18.9 ounces