NIKON M-223 8486 2-8x32 Riflescope (Black) Riflescope for AR rifles delivers extreme speed, accuracy, and shooting confidence Rapid Action turret technology allows you to dial in your elevation anywhere from 100 to 600 yards away in less than one revolution 32mm objective diameter, 2x to 8x magnification, 4 inches of eye relief Nitrogen-filled and O-ring sealed for protection against water, shock, and fog; multi-coated optics Backed by Nikon's full lifetime warranty