The combat fixed rear sight is compatible with your ar-15, m4, m16, uses standard a2 rear sight.It is constructed of billet 6061-t6 aluminum, is mil-spec height, and has a black hardcoat anodized finish.0.5 moa windage adjustment for rifle length systems.0.65 moa windage adjustment for carbine length systems.Torque clamp to 35 in/pounds.Made in the u.Sa.Rear Color: BlackFrame Material: 6061 T6 AluminumFrame Color: BlackFirearm Fit: AR-15Style: Rear Sight FixedWindage Adjustment: 0.5 MOA/ 0.65 MOAFirearm Type: AR Platform