Green Blob Outdoors Superior Ar Tactical Flip up Front and Rear Iron Sights Set for Picatinny Rails A2 223 5.56 Colt An Exclusive Green Blob Outdoors product- High Quality Diamond Shaped A2 Type Mil Spec Aluminum Premium Front and Rear Sights Set Constructed of 6061 Aircraft Grade Aluminum Calibrated and matched together as a set Rear Sight: Windage Adjustable features same MOA adjustment as standard sight Front Sight: A2 post elevation adjustment