The Magpul MBUS or Magpul Back Up Sight system has a front and rear flip sights that are rugged and something every shooter needs in case their primary optic goes down. The MBUS comes in several color patterns to choose from.

• Made of high quality DuPont Polymer
• Box set – Front and Rear Site. 
• PTS version MBUS will come with a key to adjust front sight pole

Colors: Black, Foliage Green, Dark Earth