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Magpul MBUS Flip-Up Backup Sights, Black, Rear Sight

4.8 out of 5 stars 8,569 ratings
Price: $33.99 $48.99 Free Return on some sizes and colors
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Color: Black
Size: Select Size
Brand Magpul
Color Black
Style Front Sight
Sport Hunting
Item Weight 0.08 Pounds
Material Polymer
Magnification Minimum 1 x
Compatible Devices Picatinny Mount
Mounting Type Picatinny Mount
Night vision No

About this item

  • Impact resistant polymer construction provides light weight and resists operational abuse
  • Spring-loaded flip up sight easily activated from either side or by pressing the top
  • Detent and spring pressure keeps sight erect but allows for unobstructed folding under impact, etc.
  • Clamps to most any Picatinny rail and provides the same height as standard iron sights
  • Protective wings shield the spring-locking sight post; Elevation adjustment tool included, but most aftermarket sight adjustment tools may be used as well
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From the manufacturer

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Magpul MBUS Sights

MBUS front 1

The MBUS (Magpul Back-Up Sight) is a low-cost, color injection molded, folding back-up sight. It is constructed of tough, impact resistant polymer to provide light weight and resistance to operational use.

MBUS 2

The spring-loaded flip-up sight is easily activated from either side or by pressing the top. The spring pressure and detent keeps the sight erect and in position when deployed.

MBUS 3

The detent knob on the rear sight easily and positively adjusts windage, and the front sight includes an elevation adjustment tool. However, most aftermarket A2 front sight adjustment tools may be used as well.

MBUS 4

Clamps to most any MIL-STD-1913 Picatinny/STANAG 4694 railed hand guard and provides the same height-over-bore as standard A2 irons. NOTE: Cannot be mounted to a railed gas block due to excess heat issues.

MBUS Sights
MBUS Pro Sights
MBUS Pro Offset Sights
MBUS Pro LR Adjustable Rear Sight
Customer Reviews
4.8 out of 5 stars 8,569
4.8 out of 5 stars 1,861
4.8 out of 5 stars 728
4.8 out of 5 stars 472
Price $36.46 $73.50 $77.43 $113.93
Material Polymer Steel Steel Steel
Colors Available Black, Flat Dark Earth, Gray, Olive Drab Green Black Black Black
Weight Front: 1.2 oz; Rear: 1.3 oz Front: 1.5 oz; Rear: 1.8 oz Front: 1.8 oz; Rear: 2.0 oz 2.0 oz
Center of aperture to top of rail (Rear Sight) 1.42 inches 1.41 inches N/A 1.41 inches
Height above rail, stowed 0.51 inches 0.43 inches 0.18 inches (at clamp) 0.49 inches
Length, stowed Front & Rear: 2.6 inches Front: 1.6 inches; Rear: 2.1 inches Front: 1.9 inches; Rear: 2.0 inches 2.2 inches
Length, deployed Front & Rear: 1.5 inches Front: 1 inch; Rear: 0.83 inches 0.66 inches 0.83 inches
Selectable Front Sight Post Width - no data ✓ ✓ - no data
Elevation adjustment wheel for 200-600 meter distances - no data - no data - no data ✓
Dual aperture rear sight ✓ ✓ ✓ ✓
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Product Description

Back Up Sight, Generation II, Fits Picatinny, Black, Front, Flip Up.

Product information

Technical Details

Item Package Dimensions L x W x H ‎6.57 x 3.98 x 1.26 inches
Package Weight ‎0.05 Kilograms
Item Dimensions LxWxH ‎7.5 x 1 x 4.25 inches
Item Weight ‎0.08 Pounds
Brand Name ‎Magpul
Country of Origin ‎United States
Model Name ‎MBUS Flip-Up Backup Sights
Color ‎Black
Material ‎Polymer
Suggested Users ‎unisex-adult
Number of Items ‎1
Manufacturer ‎Magpul Industries Corp.
Part Number ‎MAG247-BLK
Model Year ‎2012
Style ‎Front Sight
Included Components ‎Magpul MBUS Flip-Up Backup Sights, Black, Front Sight
Size ‎Front Sight
Sport Type ‎Hunting

Additional Information

ASIN B004SH9OUS
Customer Reviews
4.8 out of 5 stars 8,569 ratings

4.8 out of 5 stars
Best Sellers Rank
Date First Available March 17, 2011

Customer reviews

4.8 out of 5 stars
8,569 global ratings

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Customers say

Customers find these backup sights work well and appreciate their build quality, noting they hold up to years of abuse with high-quality springs. They are authentic Magpul products that fit securely on Picatinny rails and are easy to adjust for windage. Customers consider them good value for money, particularly as a cost-effective solution for rear backup sights, and find them convenient to install, deploying quickly and easily.

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Works wellBuild qualitySightValue for moneyFitEase of installationBack up sightMagpul quality
1,007 customers mention "Works well"993 positive14 negative

Customers find that the sights work well, with the flip-up mechanism operating smoothly, and one customer specifically noting its effectiveness as a backup sight.

"Okay, I want to talk a bit about these sights. Magpul makes good stuff, and they are innovative...." Read more

"...Magpul is a trusted brand known for its top-notch firearm accessories, and the MBUS Flip-Up Backup Sights reflect that dedication to excellence...." Read more

"Works as expected" Read more

"Works great!" Read more

730 customers mention "Build quality"680 positive50 negative

Customers praise the build quality of these sights, noting their high-quality springs and ability to hold up to years of abuse.

"...The sights have never shot loose, never cracked, warped, disintegrated, or malfunctioned in any of the ways mentioned in some of the 1-3 star..." Read more

"...However they are still a nice reliable and dependable back up flip up sight...." Read more

"...Made from high-quality polymer, these sights are designed to withstand the demands of real-world use, ensuring they hold up in various environments..." Read more

"...Could be my imagination: but I love this thing. It's solid, tight, retains zero, folds -REALLY- low (which is great) and what I like most: super..." Read more

621 customers mention "Sight"597 positive24 negative

Customers like these sights, describing them as great and authentic Magpul products with a sleek appearance. One customer notes that they are impressive for being made of polymer.

"...every outing off pavement and away from the covered range, they still look new, aside from some dirt hiding in some of the small corners...." Read more

"...They are nice and pretty thin so they lay flat under optics and dont stick up too much when folded down." Read more

"These sights are wonderful, some people say Troy are better and I do not disagree that troy are quality back up sights...." Read more

"Good Sight quality good value for your money. Definitely worth it" Read more

543 customers mention "Value for money"482 positive61 negative

Customers find these sights to be good value for money, describing them as a cost-effective solution for rear backup sights.

"...They are lightweight, low profile, durable, economical, and very user friendly. Just click or karate chop it, and it flips up...." Read more

"As a Retired SWAT officer. I bought this Dot for the price point and put it on my optic,It has adjustable brightness, holds zero, turns on every..." Read more

"...Great value for the price, and would recommend these if you don't like the new model...." Read more

"...the ultimate choice for ensuring accurate aiming and target acquisition when needed...." Read more

427 customers mention "Fit"340 positive87 negative

Customers find that the sights fit securely on the Picatinny rail and are easy to adjust, particularly for windage and elevation.

"...The Magpul MBUS sights are fully adjustable for windage and elevation, allowing for precise zeroing and accurate shooting...." Read more

"I love this sight to death. It's so tight to put on the rail I had to apply lube to the rail itself, tight tolerances are a good sign of quality..." Read more

"...Ready install ed and easy adjustment. Now just time will see if it holds." Read more

"fits great" Read more

401 customers mention "Ease of installation"379 positive22 negative

Customers find the sights easy to install, noting they snap into position with little effort and mount easily to the rail.

"...They are lightweight, low profile, durable, economical, and very user friendly. Just click or karate chop it, and it flips up...." Read more

"...The flip-up design allows for quick and effortless deployment when needed...." Read more

"Order came quickly and matched my other one that I got long ago. Ready install ed and easy adjustment. Now just time will see if it holds." Read more

"Magpul has always been good gear, tough and easy to use, can't go wrong with Factory Magpul stocks or sights..AA++" Read more

361 customers mention "Back up sight"328 positive33 negative

Customers praise these rear sights as excellent backup options for AR-15 rifles, with one customer noting they provide a reliable sight picture.

"The rear site is great. Wrong color" Read more

"...Really, these sights are idiot-proof... or are they?..." Read more

"These were the gold standard of back up iron sights (BUIS) for a long while. They were recently replace with the mbus 3 from magpul...." Read more

"...If you're looking for high-performance backup sights for your firearm, the Magpul MBUS Flip-Up Backup Sights are the perfect option...." Read more

261 customers mention "Magpul quality"240 positive21 negative

Customers appreciate the Magpul quality of these sights, noting they are American-made and not counterfeit.

"...To be sure, it's Magpul - expect quality, reliable gear - made to provide years of service to its user." Read more

"...It’s polymer, obviously, but it’s Magpul, and seems solid enough given the actual probability that 1. I’m going to be in a gunfight with my AR. 2...." Read more

"...But mine seem to be legit magpul and not air soft sights or Chinese knockoffs...." Read more

"...Excellent quality and craftsmanship and is everything I need out of a rear sight." Read more

Excellent Quality and Fit!!!
5 out of 5 stars
Excellent Quality and Fit!!!
I'm starting to become a big fan of Magpul and its product line including its PMags, Hand-guard, and now their rear MBUS flip sight! This rear back-up sight is made of Polymer (fancy plastic) which makes it extremely lightweight yet durable! The build quality and Quality Control on Magpul products is superb and you can feel that when holding the product as well as with the price tag. The flip-up feature is a bit sticky sometimes but works real quick 98% of the time so be aware not to pinch your finger pushing on the top button! This is a great buy if you're looking for a low profile flip-up sight to put under/behind a scope or red dot sight! I leave this on my rifle all the time because it takes a flat head to remove and I just put my Vortex Strikefire red dot sight on or a magnifying scope for long distance that I can quick detach quickly and flip up the back up sight for close quarters. Currently I'm running the flip-up sight with my red dot and it's been working great at the range. I will say I noticed like a couple other reviewers that the apertures with the larger hole is a little bit too big and the smaller hole is somewhat too small in that the center while peering through has a blackish blur at times. Just a heads up for anyone who thinks the sight holes are exactly the same size as mil-spec AR carry handle sights.
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Top reviews from the United States

  • Kindle Customer
    5.0 out of 5 stars Great to pair with fixed sites
    Reviewed in the United States on June 14, 2025
    Color: BlackSize: Rear SightVerified Purchase
    The install was a little tough, but seats firmly in place and pairs great with fixed sites. It folds down, out of site.
    Helpful
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  • Bully
    5.0 out of 5 stars Wrong color
    Reviewed in the United States on June 16, 2025
    Color: BlackSize: Rear SightVerified Purchase
    The rear site is great. Wrong color
    Helpful
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  • Scott Cunningham
    5.0 out of 5 stars MBUS REAR SIGHT AR15 ASSAULT RIFLE
    Reviewed in the United States on April 18, 2025
    Color: BlackSize: Rear SightVerified Purchase
    It does what it is supposed to. IYKYK. This makes assault rifles heavier and slows you down.
    Helpful
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  • James Likes Cheese
    5.0 out of 5 stars With a bit of common sense, you too can be satisfied
    Reviewed in the United States on February 5, 2014
    Color: Flat Dark EarthSize: Front SightVerified Purchase
    Okay, I want to talk a bit about these sights. Magpul makes good stuff, and they are innovative. I have two sets of these sights mounted to a couple of my AR15's. They are lightweight, low profile, durable, economical, and very user friendly. Just click or karate chop it, and it flips up. Push it down and it locks back down. That's it! No weird cross pin style locking mechanisms, no need to push up and lock into place. When time is of the essence, just reach up with your thumb and CLICK! It's in place faster than you can blink an eye! Good sight picture front and rear. They sit really low on the rail when not used. Installation is simple. Just push it on from the end of your AR15's picatinny rail, locate your preferred mounting spot, and put the provided screw through the sight and rail and tighten it with a screwdriver. Really, these sights are idiot-proof... or are they?

    Magpul should not have to put a disclaimer stating not to mount polymer sights to gas blocks. I figured it was only common sense, but after reading the interwebz and a couple of reviews from here, there are people out there who actually figured you could mount these to gas blocks, until they read the fine print... and the blamed the sights themselves. Like I said, I figured it was common sense, but then again, McDonald's was sued because a woman spilled her coffee in her lap and the cup wasn't labeled "HOT COFFEE." Go figure.

    Additionally, these sights are engineered to sit on top of accessory rails (rears on AR15 flat top receivers). Of course, you can mount them to other guns, but I'm speaking to the other group of people who can't get them to sight in right because they disregarded common sense and logic and actually mounted these sights to gas blocks, and then fired the gun! Most gas blocks sight below rail height. If you want a gas block mounted sight, buy one specifically designed with the extra height (and metal) in mind. Just don't go around dogging these sights because you didn't read before you installed them.

    As for durability, some people are saying that because they are plastic, they will break. Okay, well then how do you explain Glocks, FN's, XD's, M&P's and such? Oh I'm sure some have broken, but most plastic guns that are fighting in wars and being used for LE, are holding up just fine to the sort of abuses they are subjected to. My AR15 is my working gun. The MBUS sights installed on it are no exception. That AR rides in the back of pickup trucks, gets used in harsh desert conditions, fears no snow, goes up the rocky mountainsides with me, and generally sees an assortment of things that safe queens and bench rest guns would never dream of. The sights have never shot loose, never cracked, warped, disintegrated, or malfunctioned in any of the ways mentioned in some of the 1-3 star reviews. In fact, despite being on my AR15 for over a year, and accompanying me on just about every outing off pavement and away from the covered range, they still look new, aside from some dirt hiding in some of the small corners.

    They also cowitness to the lower 1/3rd of an Aimpoint Comp M3 in a Larue LT150 mount.
    46 people found this helpful
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  • tzvi cohen
    5.0 out of 5 stars Great Dot for great price.
    Reviewed in the United States on February 12, 2025
    Color: BlackSize: Front SightVerified Purchase
    As a Retired SWAT officer. I bought this Dot for the price point and put it on my optic,It has adjustable brightness, holds zero, turns on every time I pick it up. I have had it for just over a 6 month and the battery is still good. This is my daily carry and i put about 1200 rounds a month through it. Highly recommend this dot and the seller.
    Helpful
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  • Jay Dee
    4.0 out of 5 stars Go to for years, only replaced by new model
    Reviewed in the United States on April 9, 2025
    Color: BlackSize: Rear SightVerified Purchase
    These were the gold standard of back up iron sights (BUIS) for a long while. They were recently replace with the mbus 3 from magpul. However they are still a nice reliable and dependable back up flip up sight. I used these for years and never had any issues with any of the ones i owned. Great value for the price, and would recommend these if you don't like the new model. They are nice and pretty thin so they lay flat under optics and dont stick up too much when folded down.
    Helpful
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  • Steven
    5.0 out of 5 stars Reliable and Versatile Backup Sighting Solution!
    Reviewed in the United States on August 3, 2023
    Color: BlackSize: Front SightVerified Purchase
    The Magpul MBUS Flip-Up Backup Sights are an essential addition to any firearm enthusiast's setup, providing reliable and versatile backup sighting options. With their durable construction, easy-to-use flip-up design, and trusted brand reputation, these backup sights have far surpassed my expectations, offering exceptional performance and peace of mind.

    The standout feature of the Magpul MBUS Flip-Up Backup Sights is their rugged construction. Made from high-quality polymer, these sights are designed to withstand the demands of real-world use, ensuring they hold up in various environments and shooting conditions.

    The flip-up design allows for quick and effortless deployment when needed. The spring-loaded mechanism ensures the sights lock firmly in place, providing a stable and precise aiming solution.

    The Magpul MBUS sights are fully adjustable for windage and elevation, allowing for precise zeroing and accurate shooting.

    Magpul is a trusted brand known for its top-notch firearm accessories, and the MBUS Flip-Up Backup Sights reflect that dedication to excellence. They are a preferred choice for both professional shooters and casual firearm enthusiasts alike.

    The low-profile and slim design of these backup sights complement any firearm without adding unnecessary bulk or interfering with other accessories.

    In conclusion, the Magpul MBUS Flip-Up Backup Sights are a must-have accessory for firearm owners seeking reliable and versatile backup sighting solutions. Their rugged construction, easy flip-up design, and trusted brand reputation make them the ultimate choice for ensuring accurate aiming and target acquisition when needed. If you're looking for high-performance backup sights for your firearm, the Magpul MBUS Flip-Up Backup Sights are the perfect option. I highly recommend these sights for their outstanding performance and the peace of mind they bring to my shooting experiences!
    3 people found this helpful
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Top reviews from other countries

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  • Glas Bauer
    2.0 out of 5 stars Missing parts
    Reviewed in Germany on March 6, 2020
    Color: BlackSize: Rear SightVerified Purchase
    First of all... the delivery took over a month... what is acceptable due to the corona crisis.
    But what I dont understand is, when I buy an iron sight for 60,00€, that the mounting screw to fix it on the picatinny rail is missing! The package looked original and unopened, but the screw and counter washer just weren't there!
    Its no so much of a deal cause already got a screw and a washer outa my stash and mounted it... but for this price I expect all parts included- also because it shows on amazon with the mounting screw and also in the instructions!
    It would have been nice to have all parts of this sight originally from MAGPUL as thats what I paid for!
    Customer image
    Glas Bauer
    2.0 out of 5 stars
    Missing parts

    Reviewed in Germany on March 6, 2020
    First of all... the delivery took over a month... what is acceptable due to the corona crisis.
    But what I dont understand is, when I buy an iron sight for 60,00€, that the mounting screw to fix it on the picatinny rail is missing! The package looked original and unopened, but the screw and counter washer just weren't there!
    Its no so much of a deal cause already got a screw and a washer outa my stash and mounted it... but for this price I expect all parts included- also because it shows on amazon with the mounting screw and also in the instructions!
    It would have been nice to have all parts of this sight originally from MAGPUL as thats what I paid for!
    Images in this review
    Customer imageCustomer image
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  • 十割蕎麦
    4.0 out of 5 stars カラーが
    Reviewed in Japan on September 2, 2023
    Color: Flat Dark EarthSize: Rear SightVerified Purchase
    物はマグプルでしかも実銃用なので信頼性はピカイチです。しかしながらカラーを間違って買ってしまいました。
    Report
  • 神薙コウ
    5.0 out of 5 stars 要調整必要なレプリカよりやっぱ実物だよなぁ？
    Reviewed in Japan on May 31, 2025
    Color: BlackSize: Front SightVerified Purchase
    レプリカで、リアル刻印+動作も申し分無しのリアサイトを中古で買えたので、フロントも欲しいと思い購入しました。

    さすが実物！の一言で事足りる程に、可動も良し、しかも留めの為に使われてるネジにまで[MAGPUl/USA]の刻印がされてるのに驚きしかありません…

    人によって気になる点は
    20mmレールの取り付け時に硬い
    ネジロック剤？がはみ出てる
    の2点ですかね？

    注意点は起こす時に、バネが硬い為指を挟まない事、とても痛いです…
    Report