Machined aluminum sights fit onto any Picatinny rail and offer rugged open sights for AR-15 style rifles. One-piece construction and crossbolt mounting system give rigidty and strength and help sights retain zero under hard use. Fixed Rear Sight features standard A2 dual aperture with windage adjustments in ½ MOA clicks. Sights not intended for use on lower gas block rails. Sights sold separately.