Magpul MBUS Gen 2 Rear Sight – Dark Earth

Product Description

The Magpul MBUS Gen 2 Rear Sight in Dark Earth is a spring-loaded flip-up backup iron sight designed to mount on MIL-STD-1913 Picatinny rails. It provides the same height-over-bore as standard A2 iron sights and features dual apertures for quick target acquisition at varying distances.

This rear sight deploys from either side or by pressing the top. Protective wings shield both apertures, and the sight folds flat under impact to protect your optic. Windage adjustments lock positively with a detent knob.

Backup iron sights matter when your primary optic fails or loses power. The MBUS Gen 2 stays out of the way when folded and activates quickly when you need it.

Key Facts

• Construction: Impact-resistant polymer
• Rail Compatibility: MIL-STD-1913 Picatinny/STANAG 4694
• Apertures: Dual flip apertures on the same plane, both small and large
• Height-Over-Bore: Same as standard A2 iron sights
• Stowed Dimensions: 2.6 in. length, 0.51 in. height above rail
• Deployed Length: 1.5 in.

How the MBUS Gen 2 Rear Sight Mounts and Deploys

The sight clamps directly to any MIL-STD-1913 Picatinny or STANAG 4694 rail. No gunsmithing required. The clamping mechanism holds firm under recoil but allows the sight to fold if struck hard enough to prevent damage.

Deployment is spring-loaded and ambidextrous. Push from either side or press the top to bring the sight upright. A detent keeps it locked in position until you fold it manually or until impact forces it down.

The reduced size ensures compatibility with most magnified optics and red dots. Check that your optic leaves enough rail space behind it for the 2.6-inch footprint when stowed.

Dual Aperture System and Windage Adjustment

Both the small and large apertures sit on the same plane, so you flip between them without changing your sight picture height. The small aperture suits precision shots at distance. The large aperture speeds up close-range target acquisition.

Windage adjusts via a detent knob that clicks into place. Each click is positive and repeatable, so you can zero the sight and return to that setting reliably. Protective wings on both sides keep debris and impacts away from the apertures.

Why Polymer Backup Sights Work

Impact-resistant polymer keeps weight down while surviving the abuse that would crack metal sights at their mounting points. The MBUS Gen 2 weighs 1.3 ounces with hardware, so it adds negligible mass to your rifle.

Polymer also insulates against temperature extremes. Metal sights can become uncomfortably hot or cold to the touch depending on conditions. The MBUS Gen 2 stays neutral.

If you prefer metal construction or need night sight capability, browse our full selection of iron and night sights for other backup options.

Buying from Western Sport in Roanoke, TX

Western Sport is a licensed FFL/SOT dealer and gunsmith shop serving North Texas and the DFW area since 2007. Owner and gunsmith Lance Rankin and his team handle transfers, builds, and orders for optics and accessories. Call 817-393-4000 to confirm specifications or place an order.

Frequently Asked Questions

Q: Does the Magpul MBUS Gen 2 Rear Sight fit any Picatinny rail?

A: Yes, it clamps to any MIL-STD-1913 Picatinny or STANAG 4694 receiver rail. The sight occupies 2.6 inches of rail space when stowed, so confirm your optic leaves enough room behind it for mounting.

Q: What is the difference between the small and large apertures?

A: The small aperture provides a precise sight picture for longer distances, while the large aperture allows faster target acquisition at close range. Both apertures are on the same plane, so your height-over-bore does not change when you flip between them.

Q: Will the MBUS Gen 2 co-witness with my red dot or magnified optic?

A: The MBUS Gen 2 provides the same height-over-bore as standard A2 iron sights. Whether it co-witnesses with your specific optic depends on your optic’s mount height. Call 817-393-4000 to discuss your setup if you are unsure about compatibility.

Q: How do I adjust windage on the MBUS Gen 2 Rear Sight?

A: Turn the detent knob on the side of the sight. Each detent click moves the point of impact in positive, repeatable increments. The detent system holds your zero even under recoil and rough handling.

Q: Can the sight deploy if I bump it accidentally?

A: No, the sight requires deliberate pressure from either side or from the top to deploy. Once deployed, detent and spring pressure keep it upright. If the sight takes a hard impact, it will fold down to protect itself and your optic, then can be redeployed manually.

Q: Is the Dark Earth finish durable enough for field use?

A: The impact-resistant polymer construction resists operational abuse, including drops, strikes, and exposure to the elements. The finish is molded into the polymer rather than applied as a coating, so it does not chip or wear off with use.

Additional information