The Magpul Back Up Sight (MBUS) Offset Rear Sight is an effective aiming system to supplement many magnified optics on your rifle setup. It is built to work with the M1913 Picatinny rail system. If your main optic fails, rotating the firearm 45 degrees provides the shooter with fully-featured iron sights.
This sight is made of Melonited steel construction, positive detented lockup when flipped up, a tool-less windage adjustment for quick and easy zeroing, two apertures for close and medium range, and a low profile footprint to ensure compatibility with a variety of optics.
Made in America!