What are Flip Up Sights (FUS)?
Introduction
The AR15. It’s more than just a firearm; it’s a modular system, a platform of endless customization, and a symbol of American freedom. From the precision range shooter to the home defender, the AR15 caters to a wide spectrum of users. But beneath the sleek lines and customizable accessories lies a fundamental need: reliable aiming. What happens when your primary optic fails? Perhaps the battery dies on your red dot, or your scope gets damaged in the heat of a situation? That’s where the unsung hero of the AR15 world steps in: the Flip Up Sights, or FUS.
This article delves into the essential world of Flip Up Sights for the AR15, offering a comprehensive guide to understanding their purpose, selecting the right ones, and maximizing their effectiveness. We’ll explore the benefits, types, features, and best practices to ensure you’re prepared for any situation.
A Closer Look
Flip-Up Sights are a crucial addition to any AR15 setup. They are, in essence, backup iron sights that can be quickly deployed when needed. These sights consist of a front sight and a rear sight, typically designed to be easily folded down and out of the way when not in use, hence the “flip-up” designation. This low-profile design minimizes obstruction to your primary optic, while providing a reliable aiming solution when it is needed most.
The primary function of FUS is multi-faceted. First and foremost, they serve as a critical backup system for your primary optics. If your red dot sight, holographic sight, or magnified optic malfunctions, FUS are immediately available to get you back on target. This redundancy is paramount in situations where your life, or the lives of others, might depend on your ability to accurately engage a target.
Beyond backup, FUS excel in close-quarters combat, or CQB, scenarios. When operating at close ranges, a fast and intuitive aiming system is paramount. FUS often provide a quicker sight picture than trying to acquire a target through a magnified optic at close distances. The simplicity of iron sights, with their clear and easily acquired sight picture, can give the shooter an edge in these fast-paced situations.
Moreover, FUS provide an extra level of versatility in varying environmental conditions. Whether you’re facing bright sunlight, low-light situations, or adverse weather, they offer an alternative aiming method when your primary optic struggles. Many red dot sights, for example, can struggle in extremely bright sunlight, making it difficult to see the reticle. With FUS, you have a simple and reliable alternative that isn’t dependent on batteries or electronics.
Choosing Flip-Up Sights is an investment in both readiness and efficiency. Here are some of the advantages that make them a must-have for any serious AR15 enthusiast:
- Low Profile: They remain out of the way when not in use, minimizing obstruction to your primary optic, and preventing them from snagging on gear.
- Reliability: Generally, FUS are inherently reliable and are not susceptible to battery failure or electronic malfunction.
- Durability: High-quality sights are built to withstand rugged use and abuse.
- Lightweight: Their design adds minimal weight to your rifle, making them easy to carry and maneuver.
- Maintaining Zero: They are designed to hold their zero when deployed, providing consistent and accurate aiming.
Exploring Different Types of Flip Up Sights
The world of Flip Up Sights is not a monolith. They come in a variety of configurations and materials, and the best choice will depend on your individual needs and preferences.
One of the crucial factors to consider is the material used in their construction. **Polymer** sights are often favored for their lightweight and affordability. High-quality polymer sights can be surprisingly robust, capable of withstanding significant impacts and harsh conditions. However, compared to their metal counterparts, they may not offer the same level of durability over the long term.
**Metal** sights, typically made from aluminum or steel, represent a significant step up in terms of durability and resilience. Aluminum sights are common, offering a good balance of weight and strength. Steel sights are the most robust option, able to withstand the most extreme conditions. The tradeoff for their increased durability is often an increase in weight and cost.
Another key characteristic to consider is the deployment mechanism. Some sights are **spring-loaded**, designed to pop up quickly at the touch of a button or lever. This rapid deployment is a significant advantage in high-stress situations where every second counts. Other sights require **manual deployment**, which involves manually flipping them into the upright position. The advantage of manual deployment is that you can deploy them without a spring mechanism which can fail at the worst time.
Additionally, you should consider the sighting options provided. The most fundamental are iron sights, featuring a front post and a rear aperture or notch. However, various sight pictures are available, depending on the brand and model. Some sights also offer adjustable features for windage and elevation, allowing for precise zeroing.
Important Features to Evaluate
When choosing Flip Up Sights for your AR15, several key features must be carefully considered.
Material and Build Quality directly impacts durability and longevity. Consider the materials used in their construction, the finish quality, and the overall build tolerances. You want sights that can withstand harsh conditions, resist impacts, and provide consistent performance over time. Research and reviews can guide you toward reliable and durable options.
The concept of height and co-witnessing is especially crucial when using FUS with a primary optic. Co-witnessing refers to the ability of your FUS to align with your primary optic, allowing you to use either system without changing your shooting stance. The key is choosing the right height profile.
- Absolute co-witness places your FUS directly in line with the center of your optic’s reticle. This is the most common choice and provides the simplest transition between systems.
- Lower 1/3 co-witness positions the FUS in the lower third of your optic’s field of view. This allows you to see the reticle of your optic while still having access to the FUS for backup.
Adjustability is vital for accurate zeroing. Look for sights with both windage and elevation adjustments. These adjustments allow you to compensate for bullet drop, wind drift, and variations in your shooting platform. Ensure that the adjustment mechanisms are easy to use, click positively, and hold their zero under recoil.
The deployment and locking mechanism directly impact speed and reliability. The locking mechanism should be positive and secure, preventing the sights from accidentally folding down during use. The deployment action should be fast, smooth, and easy to operate, especially under stress.
A clear and easily acquired sight picture is paramount for quick target acquisition. The front sight post should be clear and well-defined, and the rear aperture or notch should provide ample visibility. The sight picture should be intuitive and easy to align, facilitating fast and accurate aiming.
Finally, make sure that the sights are compatible with your AR15’s rail system, most often a Picatinny rail. Ensure that the sights mount securely and provide a stable platform for accurate shooting.
Best Practices for Selecting Your Flip Up Sights
Choosing the right Flip Up Sights requires careful consideration and a thoughtful approach.
Firstly, make sure your selection complements your primary optic setup. If you’re using a red dot sight, consider co-witnessing options to maintain a consistent sight picture. If you’re using a magnified optic, choose sights that are compatible with the height of your scope and allow for a clear view of the target.
Secondly, evaluate your primary use case. If you are a competitive shooter focused on speed and precision, prioritize sights with a clear sight picture and rapid deployment. If you operate in close-quarters environments, consider the compact size and maneuverability of the sights. For recreational shooting, you can select for affordability and functionality.
Reviews from other users are an invaluable source of information. Look for feedback on durability, ease of use, and overall performance. Online forums, social media groups, and websites dedicated to firearms often provide valuable insights.
Set a reasonable budget. While high-end sights can offer exceptional performance and durability, you don’t necessarily need to spend a fortune to get a reliable set of sights. Find a balance between quality and affordability that aligns with your needs.
Understand the rail system on your AR15. Ensure that your Flip Up Sights are compatible with the Picatinny rail or whatever mounting system your rifle is equipped with. Most AR15s use a standard Picatinny rail, but confirming the compatibility is still crucial.
Research reputable brands. Names such as Magpul, Troy, Midwest Industries, and Daniel Defense are known for producing high-quality and reliable sights. Explore various brands to find the best fit for your needs.
Installation, Zeroing, and Care of Your FUS
Proper installation is critical for optimal performance. Most FUS mount to a Picatinny rail using a clamping system or screws. Align the sights correctly with the rail, ensure a firm grip, and tighten them securely.
After installation, it is essential to zero your sights. Find a safe shooting range. Aim at a target at a reasonable distance (usually 25 or 50 yards is a good starting point). Fire a few shots and adjust the windage and elevation as needed to align your point of impact with your point of aim. After the first adjustment of your Flip Up Sights, you may need to make minor adjustments to dial in the shots to center.
To keep your FUS in top condition, regularly clean and lubricate them. Check for wear and tear, such as loose screws or damaged components. Perform regular inspections to ensure they function correctly.
Popular Flip Up Sight Brands
Several top-tier brands stand out in the world of Flip Up Sights.
Magpul is celebrated for its combination of affordability, durability, and practical design. Their MBUS (Magpul Back-Up Sights) are a popular choice for their rugged construction and functional design.
Troy Industries offers a range of high-quality metal sights. Known for their robust construction and precise adjustments, Troy sights are a favorite among professional users.
Midwest Industries is a brand renowned for its innovative designs and sturdy construction. Their sights are known for their excellent build quality and user-friendly features.
Daniel Defense produces premium-quality sights designed to withstand the rigors of heavy use. Daniel Defense sights are known for their durability and accuracy.
Conclusion
Flip Up Sights are an essential addition to any AR15 setup. They provide a crucial backup system for your primary optics, enhance versatility, and facilitate quick target acquisition in various environments. By understanding the types, features, and best practices, you can select the right FUS for your AR15, ensuring that you are well-prepared for any situation.
Take the time to research different brands, models, and reviews. Install your chosen Flip Up Sights correctly, zero them accurately, and practice regularly. When you are familiar and confident with your sights, you will greatly enhance your ability to engage targets quickly and effectively. Remember to always prioritize safety and responsible firearm ownership.
