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Magpul MAG1166-BLK MBUS 3 Sight Front Black Flip Up AR-10/AR-15/M4/M16/M110/SR-25
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$39.99
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SKU: MAG1166BLK-840815132165
Overview
This folding front sight is designed as a compact backup option for AR-platform rifles, giving hunters and shooters a low-profile aiming solution that stays out of the way until needed. It deploys with an ambidextrous push-button and returns to standard AR-height when opened, with tool-less elevation adjustment for straightforward zeroing. The impact-resistant polymer construction keeps weight down while maintaining a rugged, streamlined profile. It is intended for use on a railed fore end that is on the same plane as the receiver rail, and it is not compatible with railed gas blocks or MOE Hand Guards.
Why Hunters Choose the Magpul
Compact Folded
Profile reduces bulk on the
Lightweight Construction
Hardware keeps added weight minimal
Impact-resistant Polymer
Construction supports a durable backup
Ambidextrous Push-button
Deployment allows quick, spring-loaded activation
Tool-less Elevation
Adjustment adds straightforward front sight
Key Features
- Folding front backup sight for AR-10, AR-15, M4, M16, M110, and SR-25 platforms
- Constructed from impact-resistant polymer for a lightweight, compact profile
- Measures 0.47 inches high folded and 1.38 inches at its widest point
- Ambidextrous push-button deployment with spring-loaded operation
- Tool-less elevation adjustment with dual-width enhanced front post
- Mounts to a Picatinny rail on the same plane as the receiver rail
Best Used For
- AR-platform owners needing a compact folding front sight for a railed fore end setup.
- Hunters who want a low-profile backup sight that stays out of the way when folded.
- Shooters building AR-10, AR-15, M4, M16, M110, or SR-25 rifles with Picatinny rails.
- Users who prefer tool-less elevation adjustment and ambidextrous spring-loaded deployment.
- Owners avoiding railed gas blocks or MOE hand guards due to compatibility limits.
Specifications
| Base Configuration | Picatinny Rail |
|---|---|
| Compatibility Notes | Cannot be mounted to a railed gas block; not compatible with MOE Hand Guards |
| Deployment | Ambidextrous push-button |
| Dual Width Enhanced Front Post | Yes |
| Elevation Adjustment | 1 MOA / 0.7 MOA |
| Firearm Fit | AR-10/AR-15/M-4/M16/M110/SR-25 |
| Firearm Type | AR Platform |
| Folded Height | 0.47 in |
| Frame Color | Black |
| Frame Material | Polymer |
| Front Color | Black |
| Front Material | Polymer |
| Made In Usa | Yes |
| Sight Height Deployed | Standard AR-height |
| Sight Type | Front Sight |
| Style | Folding Back Up Sight |
| Tool Less Adjustment | Yes |
| Weight | 25 grams with hardware |
| Width | 1.38 in |
Pros
- Compact folded profile reduces bulk on the rifle rail.
- Lightweight construction with hardware keeps added weight minimal.
- Impact-resistant polymer construction supports a durable backup sight setup.
- Ambidextrous push-button deployment allows quick, spring-loaded activation.
- Tool-less elevation adjustment adds straightforward front sight zeroing.
- Fits AR-10, AR-15, M4, M16, M110, and SR-25 platforms.
Considerations & Trade-offs
- Must be mounted on a railed fore end on the same plane as the receiver rail, so it is not compatible with MOE hand guards.
- Cannot be mounted to a railed gas block due to excess heat issues.
- Front sight is designed for AR-platform rifles with a Picatinny rail base, so fit is limited to the listed firearm platforms.
- The compact folded profile and lightweight polymer construction are practical for minimizing bulk, but they do not provide the same metal-sight feel some users may prefer.
Suggested Comparisons
- AR-15/AR-10 backup iron sight sets
- Picatinny rail folding sights
- Front flip-up sights for AR platforms
- Polymer rifle sight accessories
Suggested Accessories
- Flip-up front sight
- Picatinny rail mount
- AR platform backup sight
Frequently Asked Questions
What firearms is the MBUS 3 Front Sight designed to fit?
According to the provided specifications, it is listed for AR-10, AR-15, M-4, M16, M110, and SR-25 AR-platform firearms.
Is this front sight a folding backup sight?
Yes. The product is described as a folding back up sight with a Picatinny rail base configuration.
How does the sight deploy and adjust?
It uses spring-loaded technology and can be deployed with an ambidextrous push-button. It also includes tool-less elevation adjustment of a dual-width enhanced front post.
Can it be mounted on any AR setup?
No. The source states it cannot be mounted to a railed gas block due to excess heat issues, and it is not compatible with MOE Hand Guards. It must be mounted to a railed fore end on the same plane as the receiver rail.
What size and material details are provided?
The sight is listed at 0.47 inches high when folded, 1.38 inches at its widest point, and 25 grams with hardware. The frame and front are both specified as polymer, in black.