The Trijicon ACOG 2x20 riflescope is expertly designed for compact firearms such as UZI, H&K and MP-5 9mm submachine guns, offering a step up in fixed magnification to enhance target detection in any lighting condition. Paired with the Trijicon Compact ACOG mount w/ Q-LOC technology, this setup delivers Mil-Spec durability with a 6061-T6 aluminum construction and a tool-less, 1-handed mounting system for effortless adjustments. The spring-loaded design ensures constant retention and zero maintenance, even if the knobs are not fully tightened. With its lightweight, low-profile build and exceptional return-to-zero performance, the mount seamlessly fits any Mil-Spec or NATO picatinny rail for unmatched reliability in the field. ACOG models typically use tritium/fiber optic illuminated reticles that adjust automatically to available light conditions Several ACOG models feature user-adjustable brightness settings powered by a single AA battery, offering (6) brightness levels The fixed-power design minimizes moving parts, creating a nearly indestructible sighting system for reliable performance The "both eyes open shooting technique, enabled by Trijicon's Bindon Aiming Concept (BAC), provides a wider field of view, allowing shooters to quickly detect and respond to threats The high-quality glass and multi-coated lenses maximize light transmission, providing a clear, distortion-free field of view Most ACOG models include a bullet drop compensating and target-ranging reticle for precise aiming Proven in combat, the ACOG remains the most widely used magnified optic in military operations Built to withstand recoil from .22LR to .50 BMG, exceeding US military drop test standards Exceptionally waterproof, this optic exceeds military standards, with dry nitrogen-filled housing to eliminate fogging and ensure performance in extreme temperatures