MBUS 3 Front Flip up Sight by Magpul

The MBUS® 3 Front Sight represents the next generation of Magpul’s renowned back-up sight system, delivering a lighter, slimmer, and more streamlined design without sacrificing durability or performance. Engineered for AR-pattern rifles, this compact flip-up sight provides rapid deployment, precise elevation adjustment, and dependable backup aiming capability when optics fail.

Built from impact-resistant polymer and designed to mount directly to MIL-STD-1913 Picatinny rails, the MBUS 3 offers rugged reliability while maintaining an extremely low profile when folded. Its tool-less elevation adjustment and enhanced dual-width front post allow shooters to quickly adapt to changing conditions and maintain accurate zero in the field.

Key Features & Benefits

Low-Profile, Compact Design

• Significantly reduced size compared to earlier MBUS models

• Folds to approximately 0.47 inches above the rail for minimal obstruction

• Ideal for rifles equipped with red dots, LPVOs, or magnified optics

Spring-Loaded Rapid Deployment

• Ambidextrous push-button activation for quick sight deployment

• Reliable flip-up mechanism for fast target acquisition in emergencies

Tool-Free Elevation Adjustment

• Integrated elevation wheel allows easy adjustments without tools

• Approximate adjustment of 1 MOA per click with a 14.5-inch sight radius

Enhanced Dual-Width Front Sight Post

• Improved sight picture for both close-quarters and mid-range shooting

• Derived from the enhanced design found in the MBUS Pro series

Durable Polymer Construction

• Impact-resistant reinforced polymer resists abuse and harsh environments

• Lightweight design reduces overall rifle weight while maintaining strength

Picatinny Rail Compatibility

• Clamps securely to most MIL-STD-1913 Picatinny rails

• Standard AR-height alignment for proper co-witness with optics

Specifications

Product Type: Flip-Up Front Backup Sight

Platform Compatibility: AR-15, AR-10, M4, M16, M110, SR-25

Mounting Interface: MIL-STD-1913 Picatinny Rail

Material: Impact-Resistant Polymer

Weight: Approximately 25 g (0.9 oz)

Height Above Rail (Stowed): ~0.47 in

Width: ~1.38 in

Centerline Height: ~1.41 in

Adjustment: Tool-less elevation adjustment

Adjustment Value: ~1 MOA per click (14.5″ sight radius)

Country of Manufacture: USA