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Magpul AR-15 MBUS Rear Sight
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$55.99
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SKU: WX2*0689521
Overview
This folding rear sight is designed as a practical backup option for AR-15/M16 setups and other firearms using a 1913 Picatinny rail. It offers dual-aperture aiming with windage adjustment, giving the shooter a straightforward way to fine-tune sight alignment when iron sights are needed. The spring-loaded flip-up design can be deployed from either side or by pressing the top, and it folds away cleanly when not in use. Its impact-resistant polymer construction and protective wings make it a utilitarian choice for hunters and shooters who want a simple, low-profile sighting solution without unnecessary bulk.
Why Hunters Choose the Magpul
Adjustable Windage
Dual-aperture design for flexible sighting
Folds Low
When not in use, helping
Spring-loaded Flip-up
Action can be activated from
Impact-resistant Polymer
Construction is built for operational
Clamps Mil-std-1913
Picatinny and STANAG 4694 receiver
Key Features
- Low-cost, color injection molded folding back-up sight for AR15/M16 platforms.
- Dual-aperture rear sight adjusts for windage.
- Fits most 1913 Picatinny rail equipped weapons.
- Impact-resistant polymer construction resists operational abuse.
- Spring-loaded flip-up design activates from either side or by pressing the top.
- Protective wings shield the dual, same-plane flip apertures.
Best Used For
- AR-15 or M16 owners needing a folding back-up rear sight for 1913 Picatinny rail setups.
- Hunters and shooters who want a dual-aperture rear sight with windage adjustment.
- Users looking for a low-cost, impact-resistant polymer sight for backup use.
- Those wanting a spring-loaded flip-up sight that stays folded until needed.
- Shooters who prefer a rear sight matching standard A2 height-over-bore.
Specifications
| Activation | Spring-loaded flip-up; activated from either side or by pressing the top |
|---|---|
| Adjustable For | Windage |
| Aperture | Dual aperture |
| Can Fold With Aperture In Position | Yes |
| Compatibility | Most 1913 Picatinny rail equipped weapons |
| Construction Material | Impact-resistant polymer |
| Construction Method | Color injection molded |
| Folding | Yes |
| Height Over Bore | Same as standard A2 iron sights |
| Platform | AR15/M16 |
| Protective Wings | Yes |
| Rail Interface | MIL-STD-1913 Picatinny/STANAG 4694 receiver rail |
| Same Plane Apertures | Yes |
| Sight Type | Back-Up Sight |
| Type | Rear Sight |
| Windage Adjustment | Knob adjusts windage |
Pros
- Adjustable windage with dual-aperture design for flexible sighting options.
- Folds low when not in use, helping keep the rail area clear.
- Spring-loaded flip-up action can be activated from either side or top.
- Impact-resistant polymer construction is built for operational abuse.
- Clamps to MIL-STD-1913 Picatinny and STANAG 4694 receiver rails.
- Provides the same height-over-bore as standard A2 iron sights.
Considerations & Trade-offs
- Designed as a back-up sight rather than a primary optic, so it adds capability without replacing a dedicated sighting system.
- Fits most 1913 Picatinny rail-equipped weapons, but it is specifically tailored to the AR15/M16 platform, so compatibility should be confirmed for other setups.
- Windage is adjustable, but elevation adjustment is not mentioned in the provided product data.
- The folding polymer design helps keep the profile low, but it is still an added rail-mounted component that occupies space on the receiver rail.
Suggested Comparisons
- AR-15 backup sights
- Picatinny rail iron sights
- Folding rear sights
- A2-style iron sights
Suggested Accessories
- Picatinny rail mount
- Front sight
- Sight tool
- Protective rail cover
Frequently Asked Questions
What platforms does the MBUS Rear Sight fit?
It fits most 1913 Picatinny rail equipped weapons and is specifically tailored to the AR15/M16 platform.
Is this rear sight adjustable?
Yes. The dual aperture rear sight is adjustable for windage.
How does the sight deploy?
It is spring-loaded and can be flipped up from either side or by pressing the top.
Can the sight stay folded with either aperture selected?
Yes. The sight can still be folded with either the large or small aperture in position.
What material is the MBUS Rear Sight made from?
The source describes it as impact-resistant polymer construction, but does not provide more detailed material specifications.