---
product_id: 1836933
title: "MBUS Flip-Up Backup Sights, Black, Rear Sight"
brand: "magpul"
price: "AR$137576"
currency: ARS
in_stock: true
reviews_count: 8
category: "Magpul"
url: https://www.desertcart.com.ar/products/1836933-mbus-flip-up-backup-sights-black-rear-sight
store_origin: AR
region: Argentina
---

# Precision zero retention Spring-loaded flip-up Impact-resistant polymer MBUS Flip-Up Backup Sights, Black, Rear Sight

**Brand:** magpul
**Price:** AR$137576
**Availability:** ✅ In Stock

## Summary

> 🎯 Lock, Flip, and Dominate Your Backup Game

## Quick Answers

- **What is this?** MBUS Flip-Up Backup Sights, Black, Rear Sight by magpul
- **How much does it cost?** AR$137576 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/1836933-mbus-flip-up-backup-sights-black-rear-sight)

## Best For

- magpul enthusiasts

## Why This Product

- Trusted magpul brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Durable Lightweight Armor:** Crafted from impact-resistant polymer to survive harsh drops and rough handling without adding bulk.
- • **Rock-Solid Zero Retention:** Maintains point of impact with less than 1 MOA shift even after multiple hard impacts.
- • **Instant Tactical Readiness:** Spring-loaded flip-up mechanism deploys quickly from either side or top press—never miss a moment.
- • **Precision Elevation Control:** Includes elevation adjustment tool and protective wings to shield the sight post for reliable accuracy.
- • **Seamless Picatinny Integration:** Clamps securely to most Picatinny rails, matching standard iron sight height for perfect co-witness.

## Overview

The Magpul MBUS Flip-Up Backup Rear Sight is a lightweight, impact-resistant polymer sight designed for AR15/M16 platforms. It features a spring-loaded flip-up design for rapid deployment, clamps securely to Picatinny rails, and maintains zero with less than 1 MOA shift after severe impact tests. Engineered for tactical reliability and precision, it offers elevation adjustments and protective wings to ensure durability and accuracy in critical backup scenarios.

## Description

Reliable Backup for Battery Failures: The Magpul MBUS Front Back-Up Sight Gen 2 is a low-profile, adaptable sight designed for AR15/M16 platforms. It automatically deploys with minimal pressure and offers adjustable elevation for 1/3 co-witness with red dot sights. Crafted from impact-resistant polymer, it withstands harsh conditions and is compatible with most Picatinny-railed handguards, providing the same height-over-bore as standard A2 irons. It's a dependable backup sight for tactical or emergency situations.

Review: Great Sight for the money! - These sights are wonderful, some people say Troy are better and I do not disagree that troy are quality back up sights. But magpul are cost effective and in a drop test they seemed more durable than Diamondhead/Troy. Not only did they retain zero better than the others, but they seemed to handle impact better than metal. Taken from an article on KitUp "In order to test whether certain popular BUIS would still be serviceable after taking a hard hit, I attached three different types of BUIS - Troy Industries, Magpul Industries and Diamondhead USA - to an AR-15 rifle chambered in .300 AAC Blackout weighing 7 pounds and dropped the rifle upside down from a height of 5 feet onto a concrete surface. Other portions of the rifle were protected from damage, and each set of BUIS took a solid hit from the drop. The ammunition used was Remington Premier Match .300 AAC Blackout 125 gr OTM. Each sighting device was installed according to the manufacturer's instructions, then points of impact was established from a stable shooting position at 25 and 200 yards. After the drop, the rifle was fired again, and any change in point of impact noted. The first BUIS dropped was the Diamondhead. At first, damage appeared cosmetic only; however, the apertures could no longer be rotated, windage could not be adjusted, and there was a definite cant to the BUIS. Point of impact shifted approximately 16 MOA. We contacted Diamondhead with this result. They replied that a newer version was available which was more durable. We offered to test the new model but production issues meant they could not ship one to us. Next came the Troy sight. Cosmetic damage was apparent, but the sight could still be operated normally. Point of impact shift was approximately 3 MOA. The last set of BUIS was the Magpul MBUS. Damage was purely cosmetic and the sight remained fully functional. Point of impact shift was less than 1 MOA. Unlike the other sighting devices, a second drop was performed. Results did not change, and the sight remained functional." Now my personal experience with these is on my M&P15-22 but I'm ordering an additional MBUS for the AR I am building. They are really good quality, just make sure you don't get a PTS sight from a bad retailer.
Review: Wouldn't hesitate to buy another - 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 manufacture. Feels solid, not flimsy or wobbly. Spring retention ensures that after each shot it returns to zero. Also, the square top of the sighting ring makes obtaining accurate aim faster. I have an A3 type rifle, and the standard A2 front sight with it's dog ears protecting the front sight blade: point directly to the squared edges of this rear sight's peep ring. Which actually makes acquiring the target seem easier and faster than if it were a perfect circle rear sight ring. Maybe it's psycho somatic where it's purely me, but it quite honestly seems faster on target than metallic orb rear peeps. the square top of the sight ring, purely objectively to me at least, seems to aid in my finding the center with the front sight blade because the dog ears protecting the blade have an extra frame of reference by branching off towards the square radii left and right of the rear peep. 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 light weight. I don't like quad rails and hanging off 5 pounds of junk on my rifles. I don't put anything on one of my rifles unless the added capability the accessory brings justifies the weight it brings. I like an Ar-15 carbine to be light and fast, transition target to target quickly. I wouldn't hesitate to put one of these on any pic rail that needs a backup rear. Be it a full fledged A3/A4 combat rifle or a $5k race gun that has to have a rear sight to qualify for a division or specific course of fire. Fits tight, holds zero and weighs next to nothing: you can't go wrong with one of these. I have -NOT- had hands on experience with the mbus II FRONT sight, only the rear: so I cannot offer an informed opinion about the mbus front sight. I can say with relative confidence, I have a high opinion of magpul products in general and if the front sight is of equal quality to their rear sight - I wouldn't hesitate to use that either. I cannot however, give first hand account of what the front sight is like. I can say that -MY- mbus II rear sight is terrific, and that it's my go to choice for any pici-rail gun platform that's in need of a backup rear.

## Features

- 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004SH9OUS |
| Best Sellers Rank | #10,282 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #9 in Airsoft Gun Sights |
| Brand | Magpul |
| Brand Name | Magpul |
| Color | Black |
| Compatible Devices | Picatinny Mount |
| Country of Origin | United States |
| Customer Reviews | 4.8 4.8 out of 5 stars (8,646) |
| Date First Available | March 17, 2011 |
| Global Trade Identification Number | 00873750004310 |
| Included Components | Magpul MBUS Flip-Up Backup Sights, Black, Front Sight |
| Item Dimensions LxWxH | 7.5 x 1 x 4.25 inches |
| Item Display Dimensions | 7.75 inches |
| Item Package Dimensions L x W x H | 6.57 x 3.98 x 1.26 inches |
| Item Weight | 1.2 ounces |
| Magnification Minimum | 1 x |
| Manufacturer | Magpul Industries Corp. |
| Material | Polymer |
| Model Name | MBUS Flip-Up Backup Sights |
| Model Year | 2012 |
| Mounting Type | Picatinny Mount |
| Night vision | No |
| Number of Items | 1 |
| Package Weight | 0.05 Kilograms |
| Part Number | MAG247-BLK |
| Reticle Type | Cross |
| Size | Front Sight |
| Sport | Hunting |
| Style | Front Sight |
| Suggested Users | unisex-adult |
| Thread Type | Picatinny |
| UPC | 798632562125 784427265272 666670446632 714403355444 873750004310 |
| Weight | 1 Pounds |

## Product Details

- **Brand:** Magpul
- **Color:** Black
- **Compatible Devices:** Picatinny Mount
- **Item Weight:** 1.2 ounces
- **Magnification Minimum:** 1 x
- **Material:** Polymer
- **Mounting Type:** Picatinny Mount
- **Night vision:** No
- **Sport:** Hunting
- **Style:** Front Sight

## Images

![MBUS Flip-Up Backup Sights, Black, Rear Sight - Image 1](https://m.media-amazon.com/images/I/610tri8ATWL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Questions & Answers

**Q: Is this the genuine Mag Pul for 5.56 AR15, or the Airsoft version?**
A: As you should be. This is not the real thing. Check the size chart. 4.25mm will NOT fit on a 5.56 AR15 rifle. The top rails are standard 5.23mm on an actual AR

**Q: is this real Magpul?  or it is a PTS Magpul?**
A: This is not real,magpul commented on this subject

**Q: Does this site have two rear aperatures..one larger than the other and if so how do they work..how do you change from one to another.**
A: Yes they do. It work similar to the A2 rear sight. You just flip it up or down depending on the aperture you want. Hope that helps!

**Q: How many slots does it take on the rail?**
A: One but it covers some up when laid down.  I had room for it and a Red Dot scope on the rear rail.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Sight for the money!
*by S***8 on August 10, 2013*

These sights are wonderful, some people say Troy are better and I do not disagree that troy are quality back up sights. But magpul are cost effective and in a drop test they seemed more durable than Diamondhead/Troy. Not only did they retain zero better than the others, but they seemed to handle impact better than metal. Taken from an article on KitUp "In order to test whether certain popular BUIS would still be serviceable after taking a hard hit, I attached three different types of BUIS - Troy Industries, Magpul Industries and Diamondhead USA - to an AR-15 rifle chambered in .300 AAC Blackout weighing 7 pounds and dropped the rifle upside down from a height of 5 feet onto a concrete surface. Other portions of the rifle were protected from damage, and each set of BUIS took a solid hit from the drop. The ammunition used was Remington Premier Match .300 AAC Blackout 125 gr OTM. Each sighting device was installed according to the manufacturer's instructions, then points of impact was established from a stable shooting position at 25 and 200 yards. After the drop, the rifle was fired again, and any change in point of impact noted. The first BUIS dropped was the Diamondhead. At first, damage appeared cosmetic only; however, the apertures could no longer be rotated, windage could not be adjusted, and there was a definite cant to the BUIS. Point of impact shifted approximately 16 MOA. We contacted Diamondhead with this result. They replied that a newer version was available which was more durable. We offered to test the new model but production issues meant they could not ship one to us. Next came the Troy sight. Cosmetic damage was apparent, but the sight could still be operated normally. Point of impact shift was approximately 3 MOA. The last set of BUIS was the Magpul MBUS. Damage was purely cosmetic and the sight remained fully functional. Point of impact shift was less than 1 MOA. Unlike the other sighting devices, a second drop was performed. Results did not change, and the sight remained functional." Now my personal experience with these is on my M&P15-22 but I'm ordering an additional MBUS for the AR I am building. They are really good quality, just make sure you don't get a PTS sight from a bad retailer.

### ⭐⭐⭐⭐⭐ Wouldn't hesitate to buy another
*by M***N on March 19, 2014*

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 manufacture. Feels solid, not flimsy or wobbly. Spring retention ensures that after each shot it returns to zero. Also, the square top of the sighting ring makes obtaining accurate aim faster. I have an A3 type rifle, and the standard A2 front sight with it's dog ears protecting the front sight blade: point directly to the squared edges of this rear sight's peep ring. Which actually makes acquiring the target seem easier and faster than if it were a perfect circle rear sight ring. Maybe it's psycho somatic where it's purely me, but it quite honestly seems faster on target than metallic orb rear peeps. the square top of the sight ring, purely objectively to me at least, seems to aid in my finding the center with the front sight blade because the dog ears protecting the blade have an extra frame of reference by branching off towards the square radii left and right of the rear peep. 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 light weight. I don't like quad rails and hanging off 5 pounds of junk on my rifles. I don't put anything on one of my rifles unless the added capability the accessory brings justifies the weight it brings. I like an Ar-15 carbine to be light and fast, transition target to target quickly. I wouldn't hesitate to put one of these on any pic rail that needs a backup rear. Be it a full fledged A3/A4 combat rifle or a $5k race gun that has to have a rear sight to qualify for a division or specific course of fire. Fits tight, holds zero and weighs next to nothing: you can't go wrong with one of these. I have -NOT- had hands on experience with the mbus II FRONT sight, only the rear: so I cannot offer an informed opinion about the mbus front sight. I can say with relative confidence, I have a high opinion of magpul products in general and if the front sight is of equal quality to their rear sight - I wouldn't hesitate to use that either. I cannot however, give first hand account of what the front sight is like. I can say that -MY- mbus II rear sight is terrific, and that it's my go to choice for any pici-rail gun platform that's in need of a backup rear.

### ⭐⭐⭐⭐⭐ Expected quality.
*by C***. on December 29, 2025*

Quality I expected. Spring assist opening. Three points of contact to deploy sight is convenient. One on each side then one on top.

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---

*Product available on Desertcart Argentina*
*Store origin: AR*
*Last updated: 2026-02-14*