MagPul MBUS Gen 2 Flip-Up Front Sight for AR-15 - Durable Polymer Construction

The Magpul MBUS Gen 2 flip-up front sight is a polymer backup iron sight designed for AR-15 platforms that need a reliable secondary sighting system. Built to deploy instantly when your primary optic fails or when you need iron sights for close-quarters work, this sight combines practical engineering with the durability Magpul is known for. Its low-profile design folds flat against your receiver rail, staying out of the way and out of trouble until you need it.

What makes the MBUS Gen 2 stand out in the crowded backup sight market is its thoughtful handling. The ambidextrous, spring-loaded release tabs sit on both sides of the sight, so you can deploy or retract with either hand—no fumbling, no complicated manipulations. The streamlined contours mean there's nothing to catch on brush, slings, or your other gear when the sight is folded. The whole package takes up less than an inch of your Picatinny rail real estate and locks down tight with an included steel crossbolt. Height over bore matches standard A2 iron sights, so it will cowitness with most rear sight options.

This is a working sight for shooters who refuse to bet everything on a single point of failure. Whether you're running a rifle for hunting, home defense, or the range, the MBUS Gen 2 gives you a backup plan that doesn't add weight or complexity.

Key Features

• Spring-loaded ambidextrous deployment—flip up from either side
• Low-profile polymer construction folds flat to reduce snag points
• Steel crossbolt secures sight to receiver rail
• Uses less than 1" of Picatinny rail space
• Height over bore matches standard A2 iron sights
• Instant backup sighting if primary optic fails

Specifications

Frequently Asked Questions

Will the MBUS Gen 2 front sight work with my AR-15?

The MBUS Gen 2 mounts to any AR-15 with a Picatinny rail on the receiver. It must be mounted on a railed forend on the same plane as the receiver rail to cowitness correctly with a rear sight. It is not compatible with railed gas blocks or the MOE handguard.

Can I deploy and retract this sight with either hand?

Yes. The sight features ambidextrous spring-loaded release tabs on both sides, so you can deploy or retract it from the left or right side with equal ease.

How much rail space does it take up?

The MBUS Gen 2 uses less than 1 inch of Picatinny rail space, leaving plenty of room for optics, laser devices, or other accessories.

Will this sight cowitness with my rear iron sight?

The MBUS Gen 2 is designed to provide the same height over bore as standard A2 iron sights, which allows it to cowitness with compatible rear sights when both are deployed.