The Burris XTR Tactical Scopes are the most extreme and engineered to be the ultimate in high-performance optics. The extra-large, ultra-premium lenses produce unsurpassed resolution, clarity, and brightness. Index-matched HiLume multi-coating boosts clarity and, enhanced with Storm Coat, causes water to bead and shed off for a clearer view when water drops are present. The tube is 30MM, resulting in 25-Percent thicker main tubes and 42-Percent more strength. Double-force coil spring suspension locks the inner tube in place for unfailing accuracy. The XTR also features side turret-mounted parallax adjustment systems. The whole package is fogproof, shockproof, and warranted forever. Tactical scopes just don"t come any better.