Defiance metal front and rear flip-up steel sights are perfect for AR15 + M4 builds or any rifle with a picatinny rails. With a height of .5" when folded down, these sights are extremely low profile, compact, and will not block your optics view. The AR15 steel sights are engineered to last a lifetime. Defiance has been developing high quality products for a number of years, and these flip-up picatinny sights demonstrate their level of care and attention to detail. Whether you're shopping for primary or backup sights, you can depend on Defiance metal flip-up sights to deliver the accuracy, adjustability and longevity you're looking for.