Magpul Pro Offset Iron Sights Angled 45 Degree BUIS Front and Rear Sight Set MBUS MAG525 MAG526 All steel construction All steel construction Case hardened and finished with Melonite QPQ for extreme resistance to wear and corrosion Mounts on any MIL-STD-1913 Picatinny/STANAG 4694 rail Positive detents in both the up and down positions Standard height over bore when deployed, 45 deg. offset right-hand side