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Magpul Flip-Up Front Sight MBUS Gen 2 AR-15 Polymer Black
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$39.99
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SKU: FS-MAG247-BK-873750004310
Overview
For AR-15 owners who want a simple backup sighting option, this flip-up front sight provides a low-profile solution that stays out of the way until needed. It mounts to a standard Picatinny railed handguard on the same plane as the receiver rail and is intended to match the height-over-bore of a mil-spec A2 fixed front sight. The Gen 2 design adds a slimmer folded profile for improved optics compatibility, along with a spring-locked front sight post for consistent elevation adjustment. It is not compatible with railed gas blocks or MOE handguards, so setup should be matched to the correct rail location.
Why Hunters Choose the Magpul
Spring-loaded Deployment
Allows fast activation when needed
High-impact Polymer
Construction keeps the sight lightweight
Slimmer Gen
Optics when folded
Clamps Standard
Picatinny railed handguards for straightforward
Front Sight
Post includes a spring lock
Key Features
- Flip-up front sight for the AR-15 platform
- Constructed from high-impact polymer
- Spring-loaded deployment with side-lever or top activation
- Clamps to standard Picatinny railed handguards
- Gen 2 slimmer profile for improved optics compatibility when folded
- Front sight post includes a spring lock for elevation adjustment
Best Used For
- AR-15 owners wanting a compact backup front sight for a railed handguard setup.
- Hunters who prefer a low-profile sight that stays out of the way when folded.
- Shooters needing an affordable iron-sight option for field use and rough handling.
- Users mounting backup sights on standard Picatinny rails, not railed gas blocks.
- Those seeking a spring-loaded front sight with quick deployment and consistent elevation adjustment.
Specifications
| Color | Black |
|---|---|
| Compatibility Notes | Cannot be mounted to a railed gas block; not compatible with MOE Handguards |
| Compatible With | AR-15 |
| Country Of Origin | United States Of America |
| Front Sight Post | Spring lock for consistent elevation adjustment |
| Front Sight Type | Flip-Up Front Sight |
| Generation | Gen 2 |
| Height Over Bore | Same as mil-spec A2 fixed front sight |
| Material | Polymer |
| Mounting Type | Picatinny railed handguard |
| Optics Compatibility | Greater optics compatibility when folded |
| Spring Loaded | Yes |
Pros
- Spring-loaded deployment allows fast activation when needed on the AR-15 platform.
- High-impact polymer construction keeps the sight lightweight and unobtrusive.
- Slimmer Gen 2 profile improves compatibility with optics when folded.
- Clamps to standard Picatinny railed handguards for straightforward mounting.
- Front sight post includes a spring lock for consistent elevation adjustment.
- Designed to remain upright under spring and detent pressure until deliberately stowed.
Considerations & Trade-offs
- Designed for a standard Picatinny railed handguard on the same plane as the receiver rail; it is not compatible with railed gas blocks or MOE handguards.
- As a flip-up backup sight, it is intended to complement optics rather than replace a primary sighting system.
- Polymer construction keeps the profile light and unobtrusive, but it is not a metal sight option.
- The Gen 2 slimmer folded profile improves optics compatibility, but the sight still requires deliberate mounting and setup to match the rifle’s rail configuration.
Suggested Comparisons
- AR-15 backup iron sights
- Flip-up front sights
- Picatinny rail-mounted sights
- Polymer rifle accessories
Suggested Accessories
- Picatinny rail-mounted optic
- Rear backup iron sight
- Sight adjustment tool
- Railed handguard
Frequently Asked Questions
What rifles or platforms is this front sight made for?
It is specifically tailored for the AR-15 platform and is compatible with a standard Picatinny railed handguard on the same plane as the receiver rail.
Can it be mounted on a railed gas block or MOE handguards?
No. The product data states that MBUS front sights cannot be mounted to a railed gas block and are not compatible with MOE Handguards.
How does the sight deploy and stow?
It is spring loaded and pops up when activated by pressing down on either side lever or from the top. It folds only when deliberately stowed by the shooter or if a jarring impact causes it to fold.
What changed on the Gen 2 version?
The Gen 2 version has a slimmer profile for greater optics compatibility when folded, and the front sight post includes a spring lock for consistent elevation adjustment.
What material is it made from?
The sight is constructed of high impact polymer. The provided data does not list any other material specifications.