Installing a Magpul MBUS Rear Sight

Installing a Magpul MBUS rear sight is a straightforward process that can be completed with basic tools and a little patience. The instructions below will guide you through each step, ensuring a secure and properly aligned sight for your rifle.

Safety First

Before you begin any firearm-related work, it is crucial to prioritize safety. Always treat your firearm as if it were loaded, even if you are certain it is not. Make sure the firearm is unloaded and the action is open. Remove any ammunition from the area and ensure there is no chance of accidental discharge. Wear appropriate eye and ear protection to prevent potential injury from debris or noise during the installation process.

Gathering Your Tools

To install your Magpul MBUS rear sight, you’ll need a few basic tools. A 1/8-inch hex key or a flat-head screwdriver is essential for loosening and tightening the screw that secures the sight to the rail. You may also want to have a small punch or a plastic mallet on hand to help seat the sight firmly onto the rail. If you are removing existing sights, you may also need a sight pusher or other appropriate tools for their removal.

Identifying the Type of Sight

Before beginning installation, verify the type of Magpul MBUS rear sight you have. The standard MBUS sights are made from injection-molded polymer, while the MBUS Pro sights are made from steel. Both options are rugged and offer excellent backup capabilities. Understanding the specific features of your sight will help you during the installation process.

Removing Existing Sights (If Applicable)

If your rifle currently has a rear sight installed, you’ll need to remove it before installing the Magpul MBUS sight. The removal process will vary depending on the type of existing sight. Consult your rifle’s manual or a reliable online resource for specific instructions on removing your current sight. Ensure you handle any tools and components with care to avoid damage.

Positioning the Sight on the Rail

With the screw loosened, slide the MBUS onto the rail, ensuring the sight arm is positioned to the rear. This orientation allows the sight to fold down when not in use. Carefully adjust the sight’s position on the rail until it’s in the desired location, ensuring it’s aligned with your rifle’s barrel. Once in place, proceed to the next step to secure the sight.

Securing the Sight

Once the MBUS is positioned correctly on the rail, use the 1/8 hex key or flathead screwdriver to tighten the 10-24 Dual Drive Screw. Ensure the screw is securely fastened to prevent the sight from moving or becoming loose during use. It’s crucial to tighten the screw adequately without overtightening, as this can damage the sight or the rail. A firm but not overly forceful tightening is ideal.

Adjusting the Sight

The Magpul MBUS rear sight features windage adjustment, allowing you to fine-tune its alignment. Use the included Allen wrench to rotate the windage adjustment screw located on the side of the sight. Turning the screw clockwise will move the sight to the right, while counterclockwise movement shifts it to the left. Make small adjustments and test fire to ensure the sight is properly aligned with your desired point of impact.

Zeroing the Sight

Once the sight is securely mounted and adjusted, it’s time to zero it to your desired point of impact. Start by firing several rounds at a target at a known distance, typically 25 yards. Observe the bullet holes and adjust the sight accordingly. Use the windage and elevation adjustments to bring the point of impact to the center of the target. Repeat the process until the sight is zeroed to your satisfaction.

Troubleshooting

If you encounter any issues during installation or zeroing, there are a few common troubleshooting steps to try; Ensure the sight is properly aligned on the rail and the mounting screw is securely tightened. Double-check that the sight is not installed backwards, as this can lead to improper function. If the sight is still not working correctly, consult the Magpul website or online forums for further assistance.

Final Thoughts

Installing a Magpul MBUS rear sight is a simple and rewarding process that significantly enhances your rifle’s capabilities. With proper installation and zeroing, you’ll have a reliable backup sight ready for any situation. Remember to practice with your new sight to ensure you’re comfortable and confident using it under pressure.

Magpul MBUS Rear Sight Features

The Magpul MBUS rear sight is renowned for its robust design, incorporating a dual aperture system for versatility, a folding mechanism for convenient storage, and windage adjustment for precise aiming.

Dual Aperture System

The MBUS rear sight features a dual aperture system, providing two different sight picture options for varying conditions. The larger aperture is ideal for quick target acquisition, while the smaller aperture offers a more refined sight picture for precision shooting. This versatility allows for optimal performance in various scenarios.

Folding Mechanism

The Magpul MBUS rear sight incorporates a folding mechanism, allowing it to fold down when not in use. This feature is particularly beneficial when using optics or red dot sights, as it keeps the sight out of the way and prevents snagging. When needed, the sight can be quickly flipped up for immediate use, providing a reliable backup option.

Windage Adjustment

The Magpul MBUS rear sight features a simple windage adjustment mechanism, allowing you to fine-tune the sight’s alignment for optimal accuracy. The adjustment is typically made using a small Allen wrench or a flat-head screwdriver, and it involves moving the sight left or right to compensate for any lateral deviation in your shots. This ensures that your point of aim aligns with your point of impact.

Compatibility

Magpul MBUS rear sights are designed for compatibility with most standard 1913 Picatinny rails commonly found on AR-15 and M16 rifles. They are specifically tailored to these platforms, ensuring a secure fit and proper functionality. However, it’s always advisable to check the manufacturer’s specifications and ensure compatibility with your specific rifle model before purchasing.

Magpul MBUS Rear Sight Benefits

Magpul MBUS rear sights offer a range of benefits for shooters, including durability, lightweight construction, ease of use, and cost-effectiveness, making them a popular choice for both casual and serious shooters.

Durability

Magpul MBUS rear sights are renowned for their durability. Crafted from impact-resistant polymer or steel (depending on the model), they can withstand harsh conditions and repeated use. This rugged construction ensures the sight remains functional even when subjected to recoil, drops, and other potential damage. The durable design makes MBUS sights a reliable backup option for your rifle, ready to perform when you need them most.

Lightweight

One of the key advantages of Magpul MBUS rear sights is their lightweight design. Constructed from durable yet lightweight materials, they minimize the overall weight added to your rifle. This is especially beneficial for users who prioritize maneuverability and agility, as the reduced weight allows for faster handling and less fatigue during extended use. The lightweight design makes MBUS sights an ideal choice for those seeking a balance between durability and portability.

Ease of Use

The Magpul MBUS rear sight is designed with user-friendliness in mind. Its intuitive controls and straightforward adjustment mechanisms make it easy to use, even for novice shooters. The folding mechanism allows for quick deployment and stowing, while the clear sight picture ensures accurate aiming. The simple windage adjustment system allows for fine-tuning your point of impact without requiring specialized tools. This combination of features makes the MBUS rear sight a reliable and accessible option for a wide range of users.

Cost-Effectiveness

The Magpul MBUS rear sight offers a compelling value proposition. Compared to other high-quality backup sights, the MBUS stands out for its affordability. Its robust construction and reliable performance make it a cost-effective solution for shooters seeking reliable backup iron sights without breaking the bank. This combination of quality and affordability makes the MBUS a popular choice for budget-conscious shooters who want to ensure they have a dependable aiming solution in case their primary optic fails.

Magpul MBUS Rear Sight Installation Tips

Here are some helpful tips to make installing your Magpul MBUS rear sight a smooth and successful experience.

Flip the Sight Up for Easier Installation

Before attempting to slide the MBUS onto the rail, flip the sight up to its operational position. This will provide you with a clear view of the rail and allow for easier alignment. The sight arm will be pointing towards the rear of the rifle, making it easier to maneuver the sight onto the rail.

Remove the Charging Handle for Easier Installation

In some cases, removing the charging handle can greatly simplify the installation process. This is especially true when installing the rear sight. By removing the charging handle, you create a wider opening, allowing you to easily slide the sight onto the rail without any obstructions.

Use a 1/8 Hex Key or Flat Head Screwdriver to Loosen the Screw

Before mounting the MBUS Pro sight, use a 1/8 hex key or a flat-head screwdriver to loosen the 10-24 Dual-Drive Screw. This will allow you to slide the sight onto the rail without unnecessary force. Be careful not to completely remove the screw, as you will need it to secure the sight in place later.

Position the Sight Arm to the Rear

Once the MBUS Pro sight is loosely mounted on the rail, carefully position it so that the sight arm folds down towards the rear of the rifle. This ensures that the sight is out of the way when not in use and that it does not interfere with other optics or accessories. Once the sight is in the desired position, you can proceed to the next step.

Ensure the Sight is Securely Mounted

With the sight arm positioned to the rear, tighten the 10-24 Dual-Drive Screw using the 1/8 hex key or flat head screwdriver. Ensure that the screw is tightened securely, but avoid overtightening, which could damage the sight or the rail. After tightening the screw, check that the sight is firmly mounted and does not move or wobble when the rifle is shaken gently.

Magpul MBUS Rear Sight Resources

For additional information and support, consult the Magpul website, instruction manuals, YouTube videos, and online forums.

Magpul Website

Magpul’s official website is a valuable resource for detailed product information, including installation instructions, specifications, and compatibility details. You can find comprehensive guides and FAQs specifically for the MBUS rear sight, ensuring you have all the necessary information for a successful installation.

Magpul Instruction Manuals

Magpul provides comprehensive instruction manuals for all its products, including the MBUS rear sight. These manuals offer detailed step-by-step instructions, diagrams, and troubleshooting tips, ensuring a smooth and accurate installation. You can access these manuals directly on the Magpul website or download them as PDFs for easy reference.

YouTube Videos

YouTube is a treasure trove of instructional videos for installing Magpul MBUS rear sights. Numerous gun enthusiasts and professionals have uploaded detailed tutorials that demonstrate each step of the process. These videos offer a visual guide, allowing you to see the installation in action, which can be incredibly helpful for first-time installers.

Online Forums

Engaging with online forums dedicated to firearms and accessories can be a valuable resource for Magpul MBUS rear sight installation. These forums are populated by experienced shooters and enthusiasts who share their knowledge and offer advice on installation techniques, troubleshooting common issues, and even provide alternative methods. Joining these communities can provide a wealth of information and support throughout your installation process.