Magpul MBUS Rear Sight - Flat Dark Earth

Manufactured by Magpul Industries
Manufactured by Magpul Industries
64 Reviews

In Stock

Standard orders will ship out the same business day if ordered by 3:30 pm CST. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.



Magpul continues to grow and develop based on innovation, simplicity, and efficiency. At Magpul, mission driven requirements inform their product design, materials, and manufacturing, focusing on efficiency without sacrificing quality or performance.

The Magpul MBUS Back-Up Sight is a low-cost, color injection molded, folding back-up sight. Specifically tailored to the AR-15/M16 platform, the dual aperture MBUS Rear Sight is adjustable for windage and fits most 1913 Picatinny rail equipped weapons.

  • ~0.7 MOA (0.754"/100m) per click with a 14.5" sight radius
  • ~0.5 MOA (0.547"/100m) per click with a 20" sight radius
  • Impact resistant polymer construction
  • Spring-loaded flip up sight
  • Detent and spring pressure keeps sight deployed
  • Compatible with most Picatinny receiver rails
  • Provides the same height-over-bore as standard A2 irons
  • Protective wings shield the dual, same plane flip apertures
  • Sight may be folded with either large or small aperture in position
  • Detent knob easily and positively adjusts windage
  • Height - Stowed: ~0.51”
  • Center of aperture to top of rail: 1.42”
  • Length - Stowed: 2.6”
  • Length - Deployed: 1.5”
  • Weight: 1.3 oz
See More


ColorFlat Dark Earth
Fixed FoldingFolding
Manufacturer.Magpul Industries
Weight1.3 Oz

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

64 reviews


Mapul bus


Love these lightweight sights...perfect for SBR!

Mbus rear sight


Magpul, and primary arms, duh.

Tried and true


Mounts solid, holds zero, looks good. What more couls you wantm

great stuff


nice and low with rapid deployment.

Great sights for the budget concious


Not much that can be said about these sights that hasn't already been said.The construction is of good quality, and adjustments are precise.I prefer steel sights, but for the budget build these are hard to beat.

Great Sight


Ordered this and some other parts to finish out my build. Primary Arms had the pieces I needed and at a price equal to or less than the other vendors. They shipped out my parts quickly and I had my parts in short order to finish my AR build. I have ordered parts from Primary Arms in the past and will continue to use their services.

Great low budget option


Picked these up for my first ar build and I couldn't be happier. Great stuff from magpul as always.

Simply outstanding service!


Product was shipped so quickly I honestly couldn't believe it. If you need something, and want an assurance of quality & timely service, Primary Arms is the place to get it. I continue to be totally impressed with their fantastic customer service.

Out of Box "Goodness"


Pulled it out and set it up on my AR15 Dissy (A2 FSB on front). Set target up ag 25 yds and shot a group of 5. Results height perfect, right 2 inches. 8 clicks to the left and I am on bullseye. Alway stow the fold down sight and on the last 5 flip ups, still on target, Holds zero). I have been pleased with the cosistent operation and would buy again for my next project.

Easily Installed


Rear sight went on easily and line-up perfectly through my Red Dot sight with front sight. All-in-all this product functions as advertised.