Midwest Industries Combat Rear Sight. For AR15/M4/M16 Rifles and other platforms. Features: Mil-Spec height and Standard A2 rear sight aperture (Can use Trijicon replacement apertures- Not included). Billet machined from T6 6061 aluminum. Hardcoat anodized. Rifle .5 MOA / Carbine .65 MOA click adjustments. Weight 1.9oz. 100% Made in the U.S.A. TORQUE CLAMP SCREW TO 35 INCH/POUNDS