When it comes to shooting at extreme distances, so many variables come into play and each one of them critically important. Beginning with target acquisition, the Sightmark Core SX 10-40x56 CBR Competition Benchrest Riflescope is a long-range problem solver. Designed specifically for competition shooting and hunting, this high-powered second-focal-plane optic boasts a rugged, single-piece, hard-anodized 30mm 6061-T6 aircraft-grade aluminum tube, nitrogen-filled, IP67 waterproof and dustproof protection, fully multi-coated lenses, finely etched, red or green illuminated competition bench rest reticle with 10 brightness settings, 0.125 MOA windage and elevation adjustability with exposed, pop-up locking turrets and 40 MOA of travel. While a single CR2032 battery provides up to 100 HRs. of battery life, the Sightmark lifetime warranty delivers big on peace of mind.