The concept is simple; a durable scope with a reticle that illuminates in low light situations. And the best part is that it doesnt require batteries. Over 25 years later, the original ACOG stands the test of time and remains one of our most popular items. ACOG 4x32 Scope with Full Line Red Illumination features black crosshairs during daytime and tritium illuminates reticle at night. The reticle ranges out to 800 meters for 5.56 (.223 cal). I bought this a few weeks ago and love it, but am not going to use it like I wanted to and so it deserves a good home. I am the second owner. First was a PDX Police officer who used it in Tournaments. I have shot 60 rounds with it to zero it in at 100 yards at Tri County and shot awesome. I am willing to sell for $850 or trade for a 1911 and depending on the 1911 cash on either end.