The Vortex Crossfire II 6-18x44mm AO riflescope with the Dead-Hold BDC reticle features long eye relief, a fast-focus eyepiece, fully multi-coated lenses and resettable MOA turrets.  The single-piece tube is constructed from aircraft-grade aluminum and hard anodized for durability, and is nitrogen purged and o-ring sealed for waterproof/fogproof performance.