The MBUS® GEN 2 Sight – Front - BLK - AUTHENTIC is Magpul’s proven, ultra-reliable, and cost-effective polymer flip-up backup iron sight (BUIS), specifically crafted for AR-15, M16, and other modern sporting platforms with 1913 Picatinny rails. Renowned for its durability, fast deployment, and lightweight build, the MBUS GEN 2 is the industry’s benchmark for field-ready backup sights—offering rugged performance and legitimate Magpul authenticity that seasoned shooters trust.
Product Overview
The MBUS GEN 2 Front Sight is injection-molded from impact-resistant polymer and features a spring-loaded, ambidextrous flip-up design. It is compatible with any MIL-STD-1913 rail of the same plane as the receiver, providing exact A2 front-sight height-over-bore. Its slim, modern profile enhances compatibility with optics and accessories, folding closer to the rail when stowed. A tool is included for rapid elevation adjustments, while protective wings surround the A2 sight post for tough field conditions.
Key Features
Material: High-strength, impact-resistant polymer is lightweight (~1.2 oz with hardware) and resists heat, scratches, and abuse without adding bulk.
Spring-Loaded Flip-Up: Sight deploys instantly from either side or with a top press; remains upright through spring/detent pressure, folding only under deliberate force or to absorb major impacts.
Protective Wings: Side shields defend the spring and the sight post from damage during hard use.
Elevation Adjustment: Sight includes an elevation tool, delivering adjustments of ~1.6 MOA per click (14.5" sight radius) or ~1.2 MOA per click (20" sight radius).
A2 Height-Over-Bore: Mounts on AR15/M4/M16 flat-top rails for standard iron sight co-witnessing or backup.
Slim Profile: Reduced size for improved compatibility with low-mount optics and tight setups—lower in stowed configuration than GEN 1 and many competitors.
Simple, Secure Picatinny Clamping: Clamps to any standard MIL-STD-1913 rail, with easy installation via slotted screw.
Color: Black (BLK)—other color options include FDE and OD Green.
Technical Specifications
| Feature | Specification |
|---|
| Weight w/ Hardware | 1.2 oz |
| Height Above Rail, Stowed | 0.51? |
| Length, Stowed | 2.6? |
| Length, Deployed | 1.5? |
| Adjustment per Click | 1.6 MOA (14.5” radius), 1.2 MOA (20” radius) |
| Mounting | MIL-STD-1913 Picatinny (handguard rail only) |
| Construction | Injection-molded polymer |
| Included | Sight, elevation tool, mounting hardware |
| Made in | USA |
Use, Compatibility & Best Practices
Intended Mounting: For same-plane Picatinny handguards (not for railed gas blocks, which will damage polymer with barrel heat).
Primary/BUIS Role: Ideal as a backup to optics, but robust/precise enough to use as a primary; works with standard AR sight tooling.
Deployment: Slim design and positive click-up action make it fast to activate under stress; strong detent holds it in place even during rough maneuvers.
Adjustment: Use the included tool (or most A2 tools) to adjust for elevation; front sight presses fit all mil-spec AR heights.
Installation: Torque screw snug, aligning body flat to rail—do not overtighten; verify placement on handguard, not railed gas block.
Authenticity: How to Verify
Packaging: Authentic MBUS Gen 2 sights come in clear, professional Magpul packaging bearing Magpul branding, part number (MAG247-BLK for black), barcode, and an included adjustment tool.
Screw Color: Magpul sights use yellow Loctite on the clamping screw—counterfeits often use blue.
Build Quality: Real MBUS sights have crisp molding, sharp logos, solid tension, and even finish without flash marks or loose/rough fitment.
Markings: Look for clear, deeply molded "Magpul" and "MBUS" logos with even font; imitation products frequently have faded, poorly replicated logos or incorrect mold lines.
Fit & Function: Genuine MBUS folds flat and deploys upright cleanly; fakes often sit askew, feel loose, or lack spring tension.
Resources: Always purchase from reputable dealers or directly from Magpul to guarantee authenticity and warranty support.
Reviews & Performance
Reliability: Users consistently report flawless deployment, repeatable zero retention, and durability through training and real-world use.
Optics Compatibility: Reduced profile works perfectly with popular red dots, prisms, and LPVOs on modern builds—no snag or clearance issues, even in tight configurations.
Weight & Durability: Ultra-light, but tough enough for field and law enforcement duty. Survives drops, impacts, and rough field conditions without breakage.
Ease of Use: Flips up with minimal pressure, allows fast aiming transitions, folds away when not needed, and offers clear A2-style sight picture.
Recommended by Shooters: Highly rated in reviews for both primary AR users and backup sight setups—often preferred for the price-to-performance ratio against metal sight options.
Frequently Asked Questions
Q: Can the MBUS Front be mounted on a gas block?
A: No—mount only on same-plane Picatinny handguards; polymer cannot withstand barrel/gas block heat.
Q: Does it come with an elevation tool?
A: Yes, packaged new sights come with a Magpul adjustment tool that fits standard front posts.
Q: Will this work for co-witness with red dot optics?
A: Yes, the A2 height ensures direct co-witness (absolute or lower-1/3) with standard AR-15 sightlines.
Q: What are signs of a fake MBUS?
A: Poor logos, blue Loctite, loose fit, mold lines, and cheap packaging—genuine sights are consistent and precise.
Conclusion
The MBUS® GEN 2 Sight – Front - BLK - AUTHENTIC by Magpul is a leader in backup iron sight (BUIS) design, delivering a blend of lightweight toughness, instant deployment, and user-friendly adjustability for AR-platform owners. With proven Magpul quality, a modern low-profile body, secure mounting, and guaranteed authenticity, this sight stands above imitations—earning praise for its dependability, optic compatibility, and field performance everywhere.
