Magpul MBUS Gen 2 Rear Flip Sight, Olive Drab

Magpul MBUS Gen 2 Rear Flip Sight

The MBUS (Magpul Back-Up Sight) represents a proven approach to affordable, reliable backup iron sights. This rear sight combines practical design with genuine utility for AR-platform rifles.

Key Features

• Dual-aperture design with protective wings that shield both sight planes
• Spring-loaded flip mechanism easily activated from either side or via top release
• Windage adjustment via detent knob for precise zeroing
• Folds flat for co-witness with optics; remains functional with either aperture in position
• Fits standard 1913 Picatinny rails on AR-15/M16 platforms
• Color injection-molded polymer construction in Olive Drab Green
• Made in the USA

Accuracy and Adjustment

Windage adjustment provides 0.7 MOA per click at a 14.5-inch sight radius, or 0.5 MOA per click at a 20-inch sight radius—sufficient precision for combat and training applications.

Important Mounting Notes

This rear sight mounts to the receiver's Picatinny rail. It cannot be mounted to railed gas blocks due to heat concerns. For proper co-witness with front sights, the front MBUS must mount to a railed fore-end on the same plane as the receiver rail. Not compatible with MOE Hand Guards.

The MBUS Gen 2 delivers dependable backup capability at a price point that makes it accessible to shooters at every level.