The Trijicon ACOG (Advanced Combat Optical Gunsight) is a fixed power, compact riflescope with an illuminated reticle pattern for use in bright to low/no light. The ACOG is designed to be extremely durable and reliable. Combining traditional, precise distance marksmanship with CQB speed, many variants include a bullet drop compensated (BDC) reticle. Every feature of its design was chosen for a single purpose: to provide increased hit potential in all lighting conditions. With the Trijicon ACOG 3.5×35 LED riflescope, users can select from six adjustable brightness levels with an off between each setting, allowing the user to determine how much to illuminate the reticle – even in transitional lighting. Powered by a single AA battery, the LED ACOG can run for over 12″000 continuous hours (on setting #4). Like all ACOG models, the 3.5×35 LED is designed with a forged 7075-T6 aircraft-grade aluminum alloy housing, making it nearly indestructible. Includes a TA51 Flat Top mount.