Burris FastFire Red Dot Sights Guide: Models & Dot Sizes

# Burris FastFire Red Dot Sights Guide: FastFire 3, C, 4, and E Burris FastFire red dot sights provide a fast, simple aiming solution for handguns, shotguns, rifles, and other compatible platforms. However, choosing the right Burris FastFire optic involves more than selecting a model. Dot size, reticle design, emitter protection, mounting compatibility, and reticle color all influence which sight is best suited to a particular application. This guide explains the differences between the Burris FastFire 3, FastFire C, FastFire 4, and FastFire E, including available dot sizes, reticle patterns, and red or green illumination options. Whether you need a compact pistol optic, a versatile reflex sight for a shotgun, or an enclosed red dot for demanding conditions, understanding these differences can help you narrow down your options.

Burris FastFire Sight Comparison

The Burris FastFire series includes several compact reflex sights with different features and intended uses. The FastFire 3 is available with two dot sizes, the FastFire C emphasizes a lightweight and low-profile design for compact pistols, the FastFire 4 offers multiple reticle patterns, and the FastFire E protects its emitter inside a fully enclosed housing. The following table summarizes the key differences.

*Specifications and available configurations can vary by model number and market. Confirm the exact configuration before purchasing.*

Burris FastFire 3: 3 MOA and 8 MOA Dots

The Burris FastFire 3 is a compact red dot reflex sight available with either a 3 MOA or an 8 MOA red dot. Both versions provide 1x magnification, allowing shooters to maintain a natural view of the target while using the illuminated aiming point. The primary difference between the two FastFire 3 versions is dot size. The 3 MOA model offers a smaller aiming point that covers less of the target, while the 8 MOA model uses a larger dot that can be easier to locate quickly.

FastFire 3 with a 3 MOA Dot

The 3 MOA FastFire 3 is a versatile option for shooters who want a relatively fine aiming point. The smaller dot can be useful when aiming at smaller targets or when greater precision is desired at distance. A 3 MOA dot covers approximately 3 inches at 100 yards, 1.5 inches at 50 yards, and 0.75 inches at 25 yards. These figures describe the angular size of the dot, not the accuracy of the sight or firearm.

FastFire 3 with an 8 MOA Dot

The 8 MOA version prioritizes a larger, easier-to-find aiming point. This can be appealing for close-range applications where acquiring the dot quickly matters more than keeping the illuminated aiming point small. An 8 MOA dot covers approximately 8 inches at 100 yards and 2 inches at 25 yards. At longer distances, the larger aiming point can obscure more of a small target.

FastFire 3 Features

• Compact reflex sight with 1x magnification.
• Available with a 3 MOA or 8 MOA red dot.
• Automatic brightness adjustment with additional manual brightness settings.
• Top-access battery compartment for convenient battery replacement.
• Automatic shutoff feature to help conserve battery power.
• Available with a detachable Picatinny mounting system in applicable configurations.

Who should consider the FastFire 3? Shooters who want a straightforward red dot and prefer to choose between a smaller 3 MOA aiming point and a larger 8 MOA dot should start with the FastFire 3.

Burris FastFire C: A Compact Pistol Red Dot

The Burris FastFire C is designed for subcompact and micro-compact pistols, including applications where minimizing the weight and height of the optic is a priority. It weighs approximately 0.44 ounces and uses a 6 MOA red dot. Its lightweight polymer housing, low-profile design, and always-on operation distinguish it from the other FastFire models in this guide.

Why Choose the FastFire C?

The FastFire C is intended for shooters who want a compact optic without adding substantial weight to a pistol. Its 6 MOA dot provides a larger aiming point than the FastFire 3's 3 MOA option, helping make the illuminated dot easier to pick up during presentation. The FastFire C also features Burris Intelligent Auto-Bright technology. This system adjusts illumination according to ambient lighting conditions and is designed to keep the optic ready for use without relying solely on motion-based activation.

FastFire C Features

• 6 MOA red dot reticle.
• Ultra-lightweight design weighing approximately 0.44 ounces.
• Always-on operation with automatic brightness management.
• CR2032 battery with a stated battery life of up to 25,000 hours under specified conditions.
• RMSc mounting footprint; the appropriate slide cut, adapter, or mounting plate must be confirmed for the firearm.
• Removable rear post sight included for compatible sighting configurations.

Who should consider the FastFire C? The FastFire C is worth considering for a compatible compact or micro-compact pistol where low weight, a low-profile installation, and a readily visible 6 MOA dot are priorities. Before purchasing, verify the pistol's optic cut, mounting hardware, screw requirements, and desired iron-sight co-witness arrangement.

Burris FastFire 4: Four Selectable Reticles

The Burris FastFire 4 builds on the compact reflex-sight concept by allowing the shooter to select between four reticle patterns. Rather than choosing a fixed dot size at purchase, the user can switch among the available reticles to suit different targets and shooting preferences. The FastFire 4 also features a larger sight window than the FastFire 3, automatic brightness adjustment, and an optional screw-on protective cover that helps shield the sight from dust and debris.

FastFire 4 Reticle Options

The reticle-selection button lets the user change between these patterns. The dot and circle designs are not interchangeable in how much of the target they cover, so the preferred setting depends on the intended application and personal sight picture.

FastFire 4 Features

• Four selectable red reticle patterns.
• Larger sight window than the FastFire 3.
• Automatic brightness adjustment and manual brightness settings.
• Automatic shutoff feature.
• CR1632 battery.
• Optional screw-on protective cover that encloses the sight's open area when installed.

Who should consider the FastFire 4? The FastFire 4 is a strong option for shooters who want to experiment with different reticle patterns without replacing the optic. It is particularly worth considering when a small dot, a large dot, and circle-based aiming references each have potential advantages for the intended use.

Burris FastFire E: An Enclosed Emitter Red Dot

The Burris FastFire E is the enclosed-emitter model in this guide. Its housing surrounds the emitter, helping protect the components that generate the aiming dot from environmental exposure. Open-emitter reflex sights can leave the emitter area exposed to debris, moisture, and other contaminants. An enclosed design places the emitter inside the optic housing, reducing the chance that material will interfere with dot projection. The sight still requires ordinary lens care, and its enclosed construction does not eliminate every possible environmental issue.

FastFire E Red and Green Dot Options

The FastFire E is available with a 3.5 MOA dot in either red or green, depending on the model selected. The dot size remains the same; the difference is its illumination color. The FastFire E also features an aspherical lens design, eight daylight brightness settings, and two night-vision-compatible settings. Its always-on operation is paired with a CR2032 battery, for a stated battery life of up to 60,000 hours under specified conditions.

FastFire E Features

• Fully enclosed emitter design.
• 3.5 MOA dot available in red or green.
• Machined aluminum housing.
• Eight daylight brightness settings and two night-vision-compatible settings.
• CR2032 battery with a stated life of up to 60,000 hours under specified conditions.
• Aimpoint ACRO mounting footprint; confirm firearm and mount compatibility before ordering.
• Waterproof, shockproof, and fogproof construction.

Who should consider the FastFire E? The FastFire E is worth considering for shooters who prioritize a fully enclosed emitter, want a choice between red and green illumination, or prefer its particular mounting and brightness features. Its enclosed construction is the key difference from the open reflex designs. The FastFire 4 can use an optional cover, but that accessory-based arrangement is not identical to the FastFire E's purpose-built enclosed housing.

Understanding Red Dot Sizes: 3 MOA, 3.5 MOA, 6 MOA, and 8 MOA

One of the most important differences between Burris FastFire models is the size of the illuminated aiming dot. Dot size is measured in minutes of angle, or MOA, an angular measurement used in optics. For practical purposes, a 1 MOA dot covers approximately 1 inch at 100 yards. As the MOA value increases, the apparent dot size increases proportionally.

These are approximate angular coverage figures, not guaranteed group sizes. The dot does not determine how accurately a firearm shoots, but it does affect how much of the target the aiming point visually covers.

Is a Smaller Red Dot More Accurate?

A smaller dot can make it easier to see the edges of a small target because it covers less of the target at a given distance. That can be helpful for precise aiming. However, a smaller dot may be harder for some users to locate quickly, particularly when presenting a pistol or tracking a moving target. A larger dot is often easier to see and acquire, but it covers more of the target as distance increases. The right dot size is therefore a balance between visibility, speed, target size, and shooting distance.

Which Burris FastFire Has the Best Dot Size?

• 3 MOA: FastFire 3 or FastFire 4, for a smaller aiming point.
• 3.5 MOA: FastFire E, available in red or green.
• 6 MOA: FastFire C, for a larger dot in a compact pistol optic.
• 8 MOA: FastFire 3, for a larger fixed dot.
• 11 MOA: FastFire 4, for the largest available dot pattern in this group.

The FastFire 4 offers the greatest flexibility in dot size and pattern because it can switch between four reticles. The other models require you to choose the available configuration that best matches your preferences.

Red Dot vs. Green Dot: Which Color Should You Choose?

Reticle color affects how easily the aiming point stands out against the background. Burris FastFire models do not all offer the same color choices: the FastFire 3, FastFire C, and FastFire 4 use red reticles, while the FastFire E is available in red or green configurations.

Advantages of a Red Dot

Red is a familiar and widely used illumination color for reflex sights. It offers a straightforward aiming point and is available across the FastFire models covered in this guide. A red dot can stand out clearly against many backgrounds, but visibility depends on lighting, brightness settings, the target environment, and individual vision.

Advantages of a Green Dot

Some shooters find a green dot easier to distinguish from the surrounding scene. Others prefer red. There is no universal rule that green is always brighter, more visible, or more accurate than red. The FastFire E is the model to consider if you specifically want a green reticle within this four-model selection. Its red and green variants use the same nominal 3.5 MOA dot size.

Does Reticle Color Affect Accuracy?

Reticle color does not inherently make a sight more accurate. Accuracy depends on factors such as proper installation, zeroing, the firearm and ammunition, and the shooter's ability to use the aiming point consistently. Choose the color that you can see clearly against the backgrounds and under the lighting conditions in which you expect to shoot. If possible, view both colors in person before making a decision.

How to Choose the Right Burris FastFire Sight

The best Burris FastFire sight depends on the firearm, mounting interface, desired dot size, and the features that matter most to you.

Choose the FastFire 3 if...

• You want a compact and straightforward reflex sight.
• You prefer a choice between a 3 MOA and an 8 MOA dot.
• You want a traditional red dot with manual and automatic brightness features.

Choose the FastFire C if...

• You are looking for an especially lightweight optic for a compatible compact or micro-compact pistol.
• You prefer a 6 MOA red dot.
• You want always-on operation with automatic brightness management.

Choose the FastFire 4 if...

• You want to switch between four different reticle patterns.
• You want the flexibility of both a 3 MOA dot and an 11 MOA dot.
• You value a larger sight window and the option to add a protective cover.

Choose the FastFire E if...

• You want a fully enclosed emitter.
• You prefer a 3.5 MOA dot.
• You want the option of red or green illumination.
• You want the FastFire E's specific brightness controls, battery design, and mounting footprint.

Mounting and Compatibility Considerations

Before choosing a Burris FastFire sight, verify that it can be mounted securely on your firearm. A sight's physical dimensions and mounting footprint are not interchangeable across all models. The FastFire C uses an RMSc footprint, while the FastFire E uses an Aimpoint ACRO footprint. The FastFire 3 and FastFire 4 have different mounting considerations, and available mounting hardware can depend on the model and package. For handgun installations, confirm the pistol's factory optic cut or the exact mounting plate required. For rifles and shotguns, confirm the rail, base, or dedicated mounting system. Some firearm-specific applications require a separate mount. Also consider whether the sight will sit at the desired height relative to the iron sights. Co-witness compatibility depends on the firearm, mounting arrangement, and sight height; it should not be assumed from the optic model alone. Finally, follow the manufacturer's installation and zeroing instructions. Confirm that mounting screws are the correct length and specification, and verify zero at a suitable range before relying on the optic.

Burris FastFire Frequently Asked Questions

What is the difference between the Burris FastFire 3 and FastFire 4?

The FastFire 3 offers a fixed dot configuration in either 3 MOA or 8 MOA. The FastFire 4 lets the user select among four reticle patterns: a 3 MOA dot, an 11 MOA dot, an 11 MOA dot with a circle, or a 3 MOA dot with a circle and wings. The FastFire 4 also has a larger sight window and an optional protective cover.

What is the difference between the Burris FastFire C and FastFire E?

The FastFire C is a very lightweight, open-emitter reflex sight designed for compact and micro-compact pistols. It has a 6 MOA red dot and an RMSc mounting footprint. The FastFire E is a fully enclosed emitter optic with a 3.5 MOA dot available in red or green and an Aimpoint ACRO mounting footprint.

Which Burris FastFire models have a green dot?

The FastFire E is available with a green 3.5 MOA dot, as well as a red-dot version. The FastFire 3, FastFire C, and FastFire 4 configurations covered in this guide use red reticles.

Is a 3 MOA or 8 MOA red dot better?

A 3 MOA dot covers less of the target and can be useful when aiming at smaller targets or shooting at longer distances. An 8 MOA dot is larger and may be easier to acquire quickly at close range, but it obscures more of the target at distance. The better option depends on the intended use and personal preference.

Is the Burris FastFire 4 enclosed?

The FastFire 4 has an open reflex design, but an optional screw-on cover can help enclose the sight area and protect it from dust and debris. The FastFire E is designed from the outset as a fully enclosed emitter optic.

Does the Burris FastFire C stay on all the time?

The FastFire C uses Burris Intelligent Auto-Bright technology and is designed for always-on operation. Its system manages the dot's brightness according to ambient light and is intended to keep the optic ready for use. Battery life depends on operating conditions.

Are all Burris FastFire sights compatible with the same mounting plate?

No. Mounting compatibility varies by model and firearm. For example, the FastFire C uses an RMSc footprint, while the FastFire E uses an Aimpoint ACRO footprint. Always verify the firearm's optic cut, mounting plate, screw requirements, and the specific sight model before purchasing.

Can a Burris FastFire red dot be used on a shotgun?

Some FastFire configurations can be used on compatible shotguns, provided the correct mounting system is available. The FastFire series is used in a variety of firearm applications, but a sight that fits one shotgun does not necessarily fit another. Confirm the mounting solution for your specific firearm.

Does a larger red dot make a firearm more accurate?

Not by itself. A larger dot can be easier to find quickly, while a smaller dot covers less of the target. Neither dot size guarantees better accuracy. Proper mounting, zeroing, firearm performance, and consistent shooting technique remain important.

Final Thoughts: Finding the Right Burris FastFire

The Burris FastFire series offers several ways to match a red dot sight to your firearm and preferences. The FastFire 3 provides a choice between 3 MOA and 8 MOA dots, the FastFire C emphasizes lightweight construction for compatible compact pistols, the FastFire 4 offers four selectable reticles, and the FastFire E combines a fully enclosed emitter with a choice of red or green illumination. Start by confirming mounting compatibility, then consider dot size, reticle style, and emitter protection. Choosing the model that best fits those requirements will help you find a Burris FastFire sight suited to your intended application.