The article "What Is an ACOG?" by Will Dabbs, MD, explores the history and significance of the Trijicon ACOG (Advanced Combat Optical Gunsight), first released in 1987. The ACOG transformed tactical optics, providing a significant advantage for troops with its prismatic telescopic sight designed for the M16 and M4 rifles. Initially, the TA01 model featured a sealed housing and a fixed 4×32 magnification, using a built-in tritium phosphor to illuminate the reticle in low light conditions. Over time, newer models incorporated external light sources and battery-powered reticles, though the tritium illumination dims after about 10 to 15 years.
The ACOG has undergone various iterations to meet diverse user needs, with reticles including bullet drop compensation and inverted chevrons. Some models now feature backup iron sights or micro
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