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Magpul Rear Sight – Flip-Up BUIS for AR-15, MBUS Gen 2, Gen 3 & Pro
Magpul Rear Sight – Trusted Flip-Up BUIS for AR Platforms
When your optic fails or conditions call for iron sights, you need a reliable backup that’s ready in seconds. The Magpul Rear Sight delivers rugged performance, fast deployment, and consistent accuracy for your AR-15, AR-10, or other tactical rifle.
From the lightweight MBUS Gen 2, to the rugged all-steel MBUS Pro, Magpul’s rear sight lineup fits every build — from budget trainers to duty-ready rifles. Each sight is engineered to mount seamlessly on Picatinny rails and provide precise windage control without the need for tools.
🔧 Why Choose a Magpul Rear Sight?
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Flip-Up Spring Action – Deploys quickly and locks into place
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Tool-Free Windage Adjustment – Zero your rifle on the fly
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Standard AR Height – Ideal for absolute or lower 1/3 co-witness setups
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Picatinny Compatibility – Fits any flat-top AR or tactical carbine
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Polymer or Steel Models – Choose based on your mission needs
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Made in the USA – Built with trusted Magpul quality
Whether you need a simple BUIS or a precision rear sight for long-range shooting, Magpul has an option that aligns with your setup and budget.
🔍 Compare Magpul Rear Sight Models
| Model | Material | Adjustment | Best Use Case |
|---|---|---|---|
| MBUS Gen 2 Rear | Polymer | Windage (tool-free) | Range use, training, budget builds |
| MBUS Gen 3 Rear | Polymer | Windage (tool-free) | Lightweight builds, modern upgrades |
| MBUS Pro Rear | Steel | Windage (tool-free) | Duty rifles, rugged environments |
| MBUS Pro Offset Rear | Steel | Windage (tool-free) | Offset backup for magnified optics |
| MBUS Pro LR Rear | Steel | Windage + Elevation | Long-range precision AR platforms |
🔩 Installation & Compatibility
All Magpul rear sights mount directly to 1913 Picatinny rails. No gunsmithing required — they’re optimized for co-witnessing with popular red dots like Aimpoint, Holosun, or EOTech.
Pair your rear sight with a Magpul front sight to complete your BUIS setup and maximize your rifle’s versatility.
💬 FAQ
Q: Will Magpul rear sights work on any AR-15?
A: Yes, all Magpul rear sights fit standard Picatinny rails and are compatible with AR-15s, AR-10s, and similar tactical platforms.
Q: What’s the difference between MBUS Gen 2 and MBUS Pro?
A: Gen 2 uses lightweight polymer and is ideal for casual or range use. MBUS Pro is steel, more rugged, and built for duty or serious tactical roles.
Q: Can I co-witness these sights with a red dot?
A: Absolutely. All Magpul rear sights are AR-height and work with absolute or lower 1/3 co-witness configurations.
Q: Do I need tools to adjust windage?
A: No. All Magpul rear sights feature tool-free windage adjustment for quick zeroing.
Q: What does the “Offset” version do?
A: The MBUS Pro Offset rear sight mounts at an angle, allowing for quick transitions from a magnified optic to irons without changing your shooting position.