Magpul MBUS2 REAR Sight - BLK

Magpul Back-up Sight (MBUS) Generation 2. Compatible with all Milspec 1913 Picatinny rails, MBUS2 features a slimmer profile for increased optics compatibility and a positive detent to securely lock the front sight post in place. Lightweight reinforced polymer construction keeps added ounces to a minimum, while the spring loaded folding design ensures that the MBUS2 will stay out of the way until you need it.