Magpul MBUS Rear Sight: The Essential Backup for Your AR-15/M16 Platform (MAG248BLK)

For any serious AR-15 or M16 owner, ensuring unwavering reliability in your firearm's sighting system is paramount. While advanced optics like red dot sights or magnified scopes are incredibly effective, they are ultimately electronic devices or glass, susceptible to battery failure, impact damage, or environmental obscurants. This is where a dependable set of backup iron sights becomes not just an accessory, but a critical component of your rifle’s preparedness. If you're searching for a robust, lightweight, and rapidly deployable solution to complement your primary optic or to serve as a standalone sighting system, the Magpul MBUS (Magpul Back-Up Sight) Rear Sight, specifically the MAG248BLK model, stands out as a premier choice.

This expertly engineered folding sight addresses the fundamental need for immediate, mechanical backup in the event of primary optic failure. It’s designed for the discerning shooter who values both performance and peace of mind, whether in a competitive shooting environment, for tactical applications, or simply for reliable range use. Questions like "What's the best lightweight backup sight for my AR-15?" or "How do I ensure my rifle is always ready, even if my red dot fails?" are precisely what the Magpul MBUS Rear Sight is engineered to answer. It delivers a cost-effective yet incredibly high-performance solution, making it an indispensable part of any AR-platform setup.

Why Backup Iron Sights are Non-Negotiable for Your AR-15/M16

In the dynamic world of shooting and tactical operations, conditions can change in an instant. Your primary optic, no matter how high-quality, is not immune to unforeseen circumstances. A dead battery, a broken lens from a fall, or even extreme fogging can render it useless. Without a reliable secondary sighting system, your rifle becomes a much less effective tool.

The Magpul MBUS Rear Sight (MAG248BLK) provides that critical redundancy. When seconds count, the ability to transition quickly and seamlessly to a set of robust, zeroed iron sights can be the difference between success and failure, or even safety and risk. It's about preparedness, adaptability, and ensuring your rifle maintains its combat effectiveness under any circumstance. For those who frequently participate in training courses, competitive shooting, or simply want the utmost confidence in their firearm, the value of a solid set of backup sights like the MBUS is immeasurable.

Unveiling the Magpul MBUS Rear Sight (MAG248BLK): A Deep Dive into Reliability

The Magpul MBUS Rear Sight isn't just another folding sight; it's a testament to Magpul's commitment to innovation, durability, and user-centric design. Crafted with precision in the USA, this sight embodies the qualities that shooters demand from their equipment.

Key Features and Design Philosophy:

• Low-Cost, High-Performance Polymer Construction: The MBUS Rear Sight is ingeniously manufactured from a durable, color injection molded polymer. This choice of material allows Magpul to deliver a high-quality, robust sight at an accessible price point, without compromising on resilience or functionality. Unlike metal sights that can add significant weight, the polymer construction contributes to a lighter overall firearm.
• Rapid Deployment & Ambidextrous Activation: Designed for quick action, the spring-loaded flip-up mechanism allows for instant deployment. A simple press on the top release or activation from either side swiftly brings the sight into position, ensuring you're ready to engage immediately when needed.
• Dual Aperture System: The sight features a dual, same-plane flip aperture, providing versatility for various shooting scenarios. The larger aperture is ideal for rapid target acquisition in close quarters or low light, while the smaller aperture offers increased precision for longer-range engagements. The intelligent design allows the sight to be folded with either aperture in position, eliminating the need to select an aperture before stowing.
• Tool-Less Windage Adjustment: Precision is made easy with the detent knob, which allows for positive and intuitive windage adjustments without the need for additional tools. This user-friendly feature means you can make on-the-fly corrections quickly and efficiently, ensuring your shots remain on target.
• Protective Wings: The vulnerable apertures are shielded by robust protective wings. This thoughtful design element safeguards the critical components of the sight from accidental impact or damage, enhancing its longevity and reliability in harsh environments.
• Lightweight Design: Weighing in at a mere 1.30 ounces, the MBUS Rear Sight adds negligible weight to your firearm. This is a crucial consideration for shooters who prioritize keeping their rifle agile and maneuverable, especially during extended operations or competitive events.

Precision Adjustments and Practical Performance:

The Magpul MBUS Rear Sight is engineered for accurate zeroing and consistent performance. Understanding its adjustment capabilities is key to maximizing its effectiveness:

• 0.7 MOA (0.754"/100m) per click with a 14.5" sight radius: This level of precision is ideal for carbine-length AR-15s, allowing for fine-tuning of your point of impact at various distances.
• 0.5 MOA (0.547"/100m) per click with a 20" sight radius: For rifles with a longer sight radius, such as standard M16 or full-length AR-15 builds, the finer adjustment per click allows for even more precise zeroing, enhancing accuracy for distance shooting.

These calibrated adjustments ensure that the MBUS Rear Sight is not just a "get by" solution, but a truly accurate and reliable aiming device, capable of maintaining tight groups when properly sighted in.

Seamless Integration with Your AR-15/M16 Platform:

The MBUS Rear Sight is specifically tailored to the AR-15/M16 platform and designed to fit most MIL-STD 1913 Picatinny rail equipped weapons. This universal compatibility with standard rail systems makes installation straightforward and secure. It mounts directly onto your receiver's top rail, providing a solid and stable base for repeatable accuracy.

Considering Compatibility: What You Need to Know

While highly versatile, there are specific compatibility considerations to ensure optimal performance and longevity:

• Railed Gas Block: The Magpul MBUS Rear Sight cannot be mounted to a railed gas block due to excess heat issues. The polymer construction, while durable, is not designed to withstand the extreme temperatures generated by gas blocks, which could lead to deformation or damage. Always mount the rear sight on the receiver rail.
• Front Sight Plane: For proper function and to achieve an accurate zero, the front MBUS (if using a Magpul MBUS Front Sight) must be mounted to a railed fore end on the same plane as the receiver rail. This ensures a consistent sight picture and appropriate sight radius.
• MOE Hand Guards: Because of the requirement for a railed fore end on the same plane as the receiver, this sight is also not compatible with standard MOE Hand Guards that do not feature a top rail extending to the receiver's height. Users with MOE Hand Guards would need to upgrade to a compatible railed handguard or fore end.

Understanding these points ensures you can properly integrate the Magpul MBUS Rear Sight into your specific AR-15/M16 configuration, guaranteeing optimal performance and a long service life.

Who Benefits from the Magpul MBUS Rear Sight?

This versatile sight serves a wide array of users, each finding unique value in its design and capabilities:

• AR-15/M16 Owners and Enthusiasts: Anyone building or upgrading an AR-platform rifle will appreciate the ease of installation and the immediate enhancement in reliability.
• Tactical Professionals (Law Enforcement, Military): For those whose lives depend on their equipment, the MBUS offers a battle-proven, lightweight, and dependable backup solution for critical situations.
• Competitive Shooters: The quick deployment and precise adjustments allow for rapid transitions and accurate follow-up shots, even if primary optics fail during a stage.
• Hunters: While less common for hunting, having a reliable backup ensures that a successful outing isn't jeopardized by an optical malfunction in the field.
• First-Time AR Owners: Offers an excellent, cost-effective entry point into reliable iron sights, providing a solid foundation before investing in more complex optics, or serving as a crucial backup once optics are added.
• Home Defense Enthusiasts: For home defense scenarios, simplicity and reliability are key. The MBUS offers immediate, no-battery-needed aiming capability.

Installation and Maintenance Tips

Installing the Magpul MBUS Rear Sight (MAG248BLK) is straightforward. It clamps securely onto any MIL-STD 1913 Picatinny rail. Ensure the rail surface is clean before mounting. Use a torque wrench to tighten the cross-bolt to Magpul's recommended specifications (typically 18 in-lbs) to ensure a secure fit without over-tightening.

Maintenance is minimal due to the sight's rugged polymer construction. A simple wipe-down with a damp cloth to remove dirt and debris is usually sufficient. Avoid harsh solvents, which could degrade the polymer. Periodically check the mounting screw for tightness, especially after heavy use.

The Magpul Advantage: Trust in American Engineering

Magpul is a brand synonymous with quality, innovation, and reliability in the firearms accessory market. Their products are rigorously tested and designed to meet the demanding needs of shooters worldwide. The Made in the USA stamp on the MBUS Rear Sight (MAG248BLK) is a clear signal of their commitment to high manufacturing standards and the use of quality materials. When you choose Magpul, you're not just buying an accessory; you're investing in a component that's engineered to perform when it matters most.

Making the Smart Choice for Your AR-15/M16

In conclusion, the Magpul MBUS Rear Sight (MAG248BLK) is an indispensable addition to any AR-15 or M16 platform. It expertly blends a low-cost, durable polymer construction with critical features like rapid deployment, dual apertures, and precise windage adjustment. It offers unparalleled peace of mind, knowing that your rifle remains a fully functional and accurate tool, even in the face of primary optic failure. Whether you're a seasoned professional, a competitive shooter, or simply a responsible firearm owner, the MBUS Rear Sight delivers the reliability and performance you demand. Secure your setup with this essential backup sight, available now at DEGuns or deguns.com, and elevate your rifle's readiness to the next level.

Feature	Detail	Product Code
Brand	Magpul	873750004358
Model	MBUS Sight Rear	MAG248BLK
Firearm Fit	AR-15, M16, AR Platform
Color	Black
Frame Material	Polymer
Mount Type	MIL-STD 1913 Picatinny Rail / STANAG 4694 Rail
Style	Folding Back Up Sight
Windage Adjustment	0.50 MOA (0.547"/100m) per click w/ 20" radius 0.70 MOA (0.754"/100m) per click w/ 14.5" radius
Length	1.5" Deployed / 2.6" Stowed
Weight	1.30 oz
SKU	1132
MPN	MAG248BLK
UPC	873750004358