Magpul MBUS 3 Rear Sight, Olive Drab Green

Magpul MBUS 3 Rear Sight: The Modern Back-Up Sight Standard

The MBUS 3 represents the culmination of Magpul's decades of back-up sight development. This is a serious tool for serious shooters—refined, dependable, and built to last.

Design and Construction

Magpul engineered the MBUS 3 with a clear philosophy: maximum function in minimum package. The sight measures just 0.44 inches when folded and 1.15 inches at its widest point, making it unobtrusive on your rifle without sacrificing capability. Despite its compact footprint, it weighs a mere 30 grams with hardware.

The polymer construction is impact-resistant and durable. This is not a compromise material—it is a deliberate choice that provides reliability while keeping weight down. The aesthetic draws from the MBUS Pro line, giving you a professional appearance that matches modern rifle platforms.

Operation and Deployment

Ambidextrous Push-Button Activation: Deploy the sight from either side of the rifle with a simple push-button mechanism. The spring-loaded design ensures positive, repeatable deployment every time.

Rapid-Select Aperture System: The rear aperture adjusts for windage and features a rapid-select design. This allows you to transition between sight pictures quickly and intuitively.

Accuracy and Sight Picture

When deployed, the MBUS 3 sits at standard AR-height, placing your sight picture exactly where it should be. Adjustment precision depends on your sight radius:

• 14.5-inch sight radius: 0.5 MOA per click (0.606 inches at 100 meters)
• 20-inch sight radius: 0.4 MOA per click (0.439 inches at 100 meters)

This level of precision ensures you can make accurate adjustments for distance and environmental conditions.

Compatibility

The MBUS 3 mounts to any Picatinny rail, making it compatible with AR-15, AR-10, M4, M16, M110, SR-25, and other modern rifle platforms.

Made in the USA

Magpul manufactures the MBUS 3 in the United States, maintaining the quality standards that have made their products the choice of professionals and serious shooters worldwide.