Magpul MBUS PRO Steel Sight Set MAG275 & MAG276 BLACK Melonite Finish;Windage adjustable with low-profile knob Made from Steel (NOT POLYMER) Front Sight can be mounted on Railed Gas Block Superior Strength of other makes.Mounts on any MIL-STD-1913 Picatinny or STANAG 4694 rail MADE IN USA