ENDURANCE 30 WA SF 4-16×50 223/308 Wide Angle optical system Long Eye Relief Threaded objective for optional accessories 16 layer Fully Multi-Coated optics for exceptional clarity Side Focus control for parallax adjustment to infinity 30mm mono-tube chassis for superior strength Glass etched reticle with red illumination 6 levels of brightness with off positions in-between ¼ MOA exposed and locking turrets Fast focus eyebell and high torque zoom ring