The Trijicon 16x24 VCOG Variable Combat Optical Gunsight is a rugged variable powered riflescope that accommodates close quarter battle CQB and long distance marksmanship. It features superior glass quality and light gathering capabilities with zero distortion. The bullet drop compensating and ranging reticles allow for the shooter to quickly and accurately estimate range and apply the correct hold. Its first focal plane reticle allows the subtensions and drops to remain true at any magnification. With a forged 7075T6 aircraftaluminumalloy housing the VCOG is an exceptionally durable and nearly indestructible sighting system. It utilizes a single AA battery commonly found across the globe and offers 6 adjustable brightness settings for the LED reticle. When powered by a lithium AA battery like the one provided it boasts a considerable battery life of 700 hours at setting 4constant on. A constant eye relief means no head or stock position adjustments are needed. Waterproof for up to 20 meters 66ft the VCOG comes standard with a quickrelease mount for any 1913 Picatinny rail.