Vortex Crossfire II Rifle Scope 4-16x50mm Dead-Hold BDC, Adjustable Objective, 30mm Tube

From Vortex: With long eye relief, a fast-focus eyepiece, fully multi-coated lenses and resettable MOA turrets, there's no compromising on the Crossfire II. Clear, tough and bright, this riflescope hands other value-priced riflescopes their hat. The hard anodized single-piece aircraft-grade aluminum tube is nitrogen purged and o-ring sealed for waterproof/fogproof performance.