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MBUS® 3 FLIP-UP SIGHT SET FOR AR-15 Reviews & Ratings

The next evolution in the Magpul MBUS (Magpul Back-Up Sight) line, the MBUS 3 incorporates the best features, strengths and value of the original MBUS and MBUS Pro Sights in a feature-packed back-up sight system.

Significantly reduced in size from the MBUS, it sits at just 0.44” high when folded and 1.15” at its widest point. Its aesthetics are derived from the MBUS Pro, but the MBUS 3 Front and Rear Sight is constructed of Magpul’s impact-resistant polymer, making it lightweight and extremely durable.

Featuring the same spring-loaded technology as its predecessor, they can be deployed with an ambidextrous push-button. The MBUS 3 sits at standard AR-height when deployed.

The MBUS 3 Front Sight includes tool-less elevation adjustments and a dual width enhanced front sight similar to the MBUS Pro.

MBUS 3 Sights available in Black, Flat Dark Earth, Stealth Gray, and OD Green.
Made in the USA.

ELEVATION ADJUSTMENT

1.6 MOA (1.886"/100m) per click with a 14.5" sight radius
1.2 MOA (1.367"/100m) per click with a 20" sight radius

The MBUS 3 Rear Sight includes a rapid-select aperture system.

Rapid-select rear aperture system
0.44” high when folded
1.15” wide at widest point
Standard AR-height when deployed
Ambidextrous push-button deployment
• For attachment to M1913 picatinny rail

See all of our AR15s and AR15 parts here.

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Reviews Summary

Overall, the MBUS® 3 Flip-Up Sight Set has received mixed feedback. Many users appreciate their lightweight design and ease of installation but report difficulties with adjusting the sights and inconsistencies in fitting. While the sights are praised as solid backup options, some customers prefer the older MBUS models for better reliability and functionality.

What Reviewers Are Saying

Product Quality

60%

Reviewers have mixed feelings about the quality of the MBUS 3 sights. While some believe the sights are sturdy enough for backup use, others mention that they do not meet the quality standards of other models, particularly citing installation issues and difficulties with adjustments.

Installation Challenges

45%

A substantial number of reviewers faced installation difficulties, specifically with the tight fit on various rail systems. Some recommended using tools or modifications to make them fit, which detracted from the overall user experience.

Ease of Use

50%

Several customers noted that while the sights are generally easy to install, they had issues with front sight adjustments being too tight or malfunctioning. The rear sight, however, was praised for its improvements over previous models, leading to easier switching between apertures.

Comparison to Previous Models

55%

Many users compared the MBUS 3 to MBUS 2 and noted improvements in design and functionality, but some still favored the older versions for their reliability and ease. The overall sentiment is that while the MBUS 3 has benefits, there are concerns that affect its usability.

Value for Money

35%

The pricing of the MBUS 3 sights is frequently mentioned as a positive aspect, with many reviewers asserting that they are a great budget-friendly option for backup sights. However, some concern exists regarding their long-term viability at this price point.

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Good value

Great products and work well. Quick and fast service from Brownells

Would you recommend this? Yes, I would recommend to a friend

by CHRISTOPHER K. on October 27, 2026

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AR sights

Had to do a little filing to make it fit. They function great.

by PATRICK L. on August 11, 2026

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Could be better.

Would give these a 3 but i just put 2 sets on 2 different rifles so they are brand new and i dont know how well they will work or last..This is just my opinion and i am a magpul fanboy for sure , great products and company..BUT they are not the quality of the PRO's..Very difficult to instal on your rail and just not the qualty of same priced BUIS i have used in the past.I had to take a small mallet to get them to seat on the rail and they are difficult to manipulate .I know they are at a different pricepoint than the PRO's but i dont think i will buy these again as there are better options out there.

Good improvement over the MBUS2 but AUG owners beware

These are a great improvement over the MBUS 2. I think they’re easier to adjust and the low light rear aperture is worlds better than the previous one. My only complaint is I tried putting this on my Steyr AUG and they are ever so slightly too small to fit on the rail (or the AUG rail is too big). They work great on my BCM AR though. So just watch out if you’re looking at these for your AUG. The MBUS 2 fit fine on the AUG

by Kevin L. on September 01, 2023

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