Magpul's MBUS 3 sights are the next evolution in the Magpul Back-Up Sight lineup. The MBUS 3 combines the strength and value of the original MBUS with the aesthetics and profile of the MBUS Pro. Significantly reduced in size from the MBUS, it sits at just 0.55" high when folded, 1.38" at its widest point, and weighs a scant 30 grams with hardware.Specifications and Features: Magpul Industries Item Number: MAG1167-BLK MBUS 3 Rear Sight Standard AR Height When Deployed Slim and Low Profile Attaches to MIL-STD-1913 Picatinny Rails Impact-Resistant Polymer Construction Spring-Loaded Flip Up Design Height (when folded): 0.55" 1.38" Wide at Widest Point Weight: 1.06 oz Made in the USA Black Finish