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Availability: In Stock
The Magpul MBUS 3 rear flip-up sight for AR-15, AR-10, M4, and M16 platforms is a no-nonsense backup optic that bridges the gap between minimal bulk and real-world reliability. Whether you're running a primary scope, red dot, or thermal, a quality backup iron sight belongs on your rifle—and the MBUS 3 delivers the essentials without the weight penalty or snag risk of earlier generations. Built from impact-resistant polymer, it's tough enough to handle duty-grade use while staying lightweight enough that you'll forget it's there until you actually need it.
The design philosophy here is practical: fold it away at just 0.44 inches tall and it vanishes under your optic mounting footprint. When deployed, the spring-loaded mechanism pops up to standard AR-height with a push of the ambidextrous deployment button—no fumbling, no fiddling. The rapid-select aperture system gives you flexibility for different shooting distances and lighting conditions, a smart feature when your primary optic is down and you're forced to make do.
The Olive Drab Green finish matches contemporary M-LOK and Picatinny builds while resisting shine that could compromise your position. Mounted directly to your M1913 Picatinny rail (or adapter), the MBUS 3 integrates seamlessly with standard AR configurations. It's made in the USA and represents genuine value for shooters who respect the principle that backups aren't optional—they're insurance.
| Brand | Magpul |
| Model | MBUS 3 Rear Sight |
| Color | Olive Drab Green |
| Height When Folded | 0.44 inches |
| Width at Widest Point | 1.15 inches |
| Deployment Height | Standard AR-height |
| Material | Impact-resistant polymer |
| Activation | Ambidextrous push-button |
| Rail Compatibility | M1913 Picatinny |
| Suitable For | AR-15, AR-10, M4, M16 |
| Country of Origin | USA |
Yes. The MBUS 3 deploys to standard AR-height, which allows cowitness setups with most common optics mounted on the upper receiver. For specific optic combinations, measure your sight line and rail spacing, but the standard-height design is built for this role.
The MBUS 3 mounts to M1913 Picatinny rail. If your rifle uses M-LOK, you'll need an M-LOK-to-Picatinny adapter rail section.
The ambidextrous push-button deployment allows you to flip it up from either side of the rifle with minimal effort. The spring-loaded mechanism does the work.
The rapid-select aperture gives you different aiming points and sight picture options, useful for transitioning between distances or lighting conditions while relying on iron sights.
SKU: 115646866 • Width: 4in • Height: 1.2in • Depth: 6.5in • Weight: 0.1oz
Availability: In Stock
The Magpul MBUS 3 rear flip-up sight for AR-15, AR-10, M4, and M16 platforms is a no-nonsense backup optic that bridges the gap between minimal bulk and real-world reliability. Whether you're running a primary scope, red dot, or thermal, a quality backup iron sight belongs on your rifle—and the MBUS 3 delivers the essentials without the weight penalty or snag risk of earlier generations. Built from impact-resistant polymer, it's tough enough to handle duty-grade use while staying lightweight enough that you'll forget it's there until you actually need it.
The design philosophy here is practical: fold it away at just 0.44 inches tall and it vanishes under your optic mounting footprint. When deployed, the spring-loaded mechanism pops up to standard AR-height with a push of the ambidextrous deployment button—no fumbling, no fiddling. The rapid-select aperture system gives you flexibility for different shooting distances and lighting conditions, a smart feature when your primary optic is down and you're forced to make do.
The Olive Drab Green finish matches contemporary M-LOK and Picatinny builds while resisting shine that could compromise your position. Mounted directly to your M1913 Picatinny rail (or adapter), the MBUS 3 integrates seamlessly with standard AR configurations. It's made in the USA and represents genuine value for shooters who respect the principle that backups aren't optional—they're insurance.
| Brand | Magpul |
| Model | MBUS 3 Rear Sight |
| Color | Olive Drab Green |
| Height When Folded | 0.44 inches |
| Width at Widest Point | 1.15 inches |
| Deployment Height | Standard AR-height |
| Material | Impact-resistant polymer |
| Activation | Ambidextrous push-button |
| Rail Compatibility | M1913 Picatinny |
| Suitable For | AR-15, AR-10, M4, M16 |
| Country of Origin | USA |
Yes. The MBUS 3 deploys to standard AR-height, which allows cowitness setups with most common optics mounted on the upper receiver. For specific optic combinations, measure your sight line and rail spacing, but the standard-height design is built for this role.
The MBUS 3 mounts to M1913 Picatinny rail. If your rifle uses M-LOK, you'll need an M-LOK-to-Picatinny adapter rail section.
The ambidextrous push-button deployment allows you to flip it up from either side of the rifle with minimal effort. The spring-loaded mechanism does the work.
The rapid-select aperture gives you different aiming points and sight picture options, useful for transitioning between distances or lighting conditions while relying on iron sights.
SKU: 115646866 • Width: 4in • Height: 1.2in • Depth: 6.5in • Weight: 0.1oz
