Solid one-piece, aircraft-grade aluminum-alloy construction makes Vortex's Diamondback Riflescopes strong, shockproof and resistant to magnum recoil. Fully multicoated optics increase light transmission for sharp, brilliant images. Two reticle options: Choose V-Plex for all-purpose hunting or the Dead-Hold BDC reticle to simplify hold-over and windage corrections on long-range shots. The Precision-Glide Erector System ensures smooth magnification changes. Capped reset turrets allow re-indexing to zero after sighting scope in. It features a second focal-plane reticle and its listed reticle subtensions for range, holdover and wind drift remain accurate at the highest magnification. O-ring sealed and argon purged for waterproof and fogproof performance. 1" tube with a low-glare hard-anodized finish. Back by the Vortex VIP unlimited lifetime warranty. Rugged, magnum-recoil-resistant construction Fully multicoated optics deliver sharp, brilliant images Precision-Glide Erector System for smooth zooms Capped reset turrets allow re-indexing to zero Argon purged for waterproof, fog proof performance