MINOX ZA 5 2-10x40 Riflescope BDC Reticle Mid-power riflescope with 2-10x magnification and 40mm 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 13.1 ounces