MBUS® FLIP-UP REAR SIGHT FOR AR-15

MBUS® FLIP-UP REAR SIGHT FOR AR-15 Reviews & Ratings

The MBUS (Magpul® Back-Up Sight) is a low-cost, color injection molded, folding back-up sight. The dual aperture MBUS Rear Sight is adjustable for windage and fits most 1913 Picatinny rail equipped weapons, but is specifically tailored to the AR15 / M16 platform.



FEATURES

  • Spring-loaded flip up sight easily activated from either side or by pressing the top
  • Protective wings shield the dual, same plane flip apertures
  • Sight can still be folded with either large or small aperture in position
  • Detent knob easily and positively adjusts windage
  • Impact-resistant polymer construction provides light weight and resists operational abuse
  • Detent and spring pressure keeps sight erect but allows for unobstructed folding under impact, etc.
  • Clamps to MIL-STD-1913 Picatinny/STANAG 4694 receiver rail and provides the same height-over-bore as standard A2 irons
  • Made in the USA.



SPECS

  • Position: Rear
  • Height above rail, stowed: ~0.51 in.
  • Length, deployed: 1.5 in.
  • Length, stowed: 2.6 in.
  • Weight, w/ hardware: 1.3 oz.
  • Center of aperture to top of rail: 1.42 in.



WINDAGE ADJUSTMENT

  • ~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

See all of our AR15s and AR15 parts here.

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Reviews Summary
Customers appreciate the MBUS Flip-Up Rear Sight for its affordability, ease of installation, and decent performance. While many praise its functional design and ambidextrous features, some express concerns about durability and long-term usability. Overall, the sight is seen as a reliable backup option but may not suit more demanding shooting needs.
What Reviewers Are Saying
Affordability
60%
Many reviewers highlight the cost-effectiveness of the MBUS Flip-Up Rear Sight, making it an accessible option for users seeking reliable iron sights without breaking the bank. This theme is prevalent among those comparing it to pricier alternatives, with approximately 60% of reviewers acknowledging its good value for the price.
Ease of Installation
70%
Installation is frequently mentioned as simple and straightforward. Reviewers have found that the sight mounts easily, which enhances user experience and adds to its appeal as a quick solution for backup sights, with around 70% of users commenting positively in this regard.
Durability Concerns
40%
A significant number of users express reservations about the long-term durability of the MBUS, suggesting that while it is functional, it may not withstand heavy use effectively. This concern has been noted by about 40% of reviewers who question its sturdiness compared to all-metal alternatives.
Performance & Usability
35%
While most reviews mention that the sights work as advertised, some customers critique their performance under specific conditions, such as aiming speed and accuracy. This theme is relevant for those who need precision in their shooting, with roughly 35% of users discussing usability issues.
Customer Experience
55%
Reviewers consistently praise the fast shipping and reliable service from retailers like Brownells, contributing positively to the overall customer experience. This aspect has been positively highlighted by about 55% of buyers, enhancing satisfaction with the purchasing process.
Design Features
50%
Several users remark on the thoughtful design, such as ambidextrous deployment and color-coded options for various calibers, which many find advantageous. Approximately 50% of customers appreciate these features, recognizing them as beneficial for efficient use.
4
Best tactical color BUIS
OD green is my favourite color in tactical type firearms. Black guns is more common while OD green is more stunning with tactical type rifles when coordinated properly with matching furniture. Magpul's MBUS is an excellent alternative to metal BUIS at the fraction of the price. However, care must be observe not to excert excessive force when tightening the assembly screw as it will crack the plastic material. The supplied front adjustment tool makes sight adjustment a breeze. Great design, easy to install and higly functional.
4
I would by it again
Mounted this on my AR build and have had no problems. I only rated it 4 stars because the peep sight could be smaller for the long range shooting. Overall though very satisfied and will purchase again for my next build. Brownells has fast shipping to, withing three days I had my sight.
4
MBUS GEN 2 REAR OD GREEN by MAGPUL
I use this on my 9mm AR low profile nice look and works as advertised a bit tight with the changing of the sight aperture and sighting in but works none the less.
4
Mmmmmmm.... bear claws!
I have both the original MBUS and the Gen 2 MBUS installed on my rifles and they are both reliable well made sights. While the Gen 2 is a bit lower profile and the retaining nut casing is a tad thicker, I really don't see a huge difference in the two products. For the money, a great BUS, I just don't see what all of the hoopla and the suspense was about. Well worth the money, though.