In tactical carbine work, target acquisition speed is very important. This applies whether you are shooting at a 3-Gun range, getting out of a patrol vehicle, or facing a real-world threat. The moment distances collapse from 300 yards to bad‑breath range, you can’t...
How the RBU Provides a Secure, No-Mill Solution for Glock Optic Upgrades
Upgrading your Glock pistol with a red dot sight can enhance your accuracy, speed, and target acquisition—but many shooters hesitate at the thought of slide milling, long lead times, or permanently altering their firearm. That’s exactly why the Dueck Defense Red Dot Backup Sight (RBU) exists. It’s a rugged, no-mill Glock mounting plate that provides a reliable, reversible, and professional-grade solution for mounting red dot optics on your Glock, without a slide cut or optic cut.
In this article, we’ll explore how the RBU works, why it’s a top-tier option among no-mill solutions for Glock upgrades, and answer three common questions:
- What is the RBU for multiple red dots on a Glock?
- Is it worth putting a red dot on a Glock?
- Can you put sights on a Glock?
Let’s dive into how the RBU lets you enhance your Glock pistol, without compromise.
What Is the RBU for Multiple Red Dots on a Glock?
The RBU (Red Dot Back Up) is a no-mill solution for Glock owners who want to mount a red dot optic without permanent modifications like a slide cut. Instead of requiring slide milling, the RBU is installed by replacing your factory rear sight—a fast, effective, and non-invasive upgrade that acts as a Glock mounting plate for optics.
Designed and manufactured by Dueck Defense, the RBU is compatible with several popular red dot sights, including:
- Trijicon RMR and SRO
- Leupold DeltaPoint Pro
- Vortex Viper and Venom
- Burris FastFire
Each model is CNC-machined from durable 7075 aluminum and finished with a mil-spec hard anodized coating for extreme resilience under recoil and harsh conditions.
Browse the full lineup here:
The beauty of the RBU is that it provides secure mounting without an optic cut, meaning there’s no lead time waiting for custom machining, and no risk of voiding your Glock’s warranty. If you ever want to revert to a stock setup, you simply reinstall the rear sight. The RBU acts as a plug-and-play Glock mounting plate, no gunsmithing required.
Is It Worth Putting a Red Dot on a Glock?
If you’ve ever wondered whether it’s worth putting a red dot on your Glock pistol, the answer is a resounding yes, especially when paired with a no-mill Glock mounting plate like the RBU.
Why Add a Red Dot?
Here’s why shooters across the spectrum, from concealed carriers to competitive marksmen, are making the switch:
1. Faster Target Acquisition
With a red dot, there’s no need to align front and rear sights. Just place the dot on target and press. This saves valuable time in defensive or timed shooting scenarios.
2. Improved Accuracy
Red dots eliminate parallax and simplify aiming, helping shooters deliver accurate shots even under pressure. For those with aging eyes, this upgrade is a game-changer.
3. Better Performance in Low Light
Red dot sights often feature brightness adjustments and are compatible with night vision equipment, offering significant advantages over traditional iron sights in low-light environments.
4. Built-In Backup Iron Sights
The Dueck Defense Red Dot Backup Sight includes integrated iron sights that co-witness with your optic. If your red dot ever fails, your backup sight picture is already in place, no need for extra parts or modifications.
Not sure which optic to pair with your RBU?
Read our guide on how to choose the perfect red dot sight.
We highly recommend pairing your optic with the RBU if you want the benefits of red dot performance without the drawbacks of slide milling or permanent slide alterations.
Can You Put Sights on a Glock?
Absolutely. One of the key benefits of owning a Glock pistol is its modularity. Whether you’re upgrading your rear sight, adding a red dot, or swapping out your iron sights, Glock gives you plenty of flexibility.
Your Sighting Options Include:
- Standard Iron Sights: Easy to upgrade, many users replace stock Glock sights with fiber optic or tritium options for improved visibility.
- Red Dot Sights: Traditionally, this required a costly slide cut or optic cut, involving long lead times and permanent slide modification.
- No-Mill Solutions: Thanks to the Dueck Defense RBU, you can now install red dot sights without slide milling, making this the best of both worlds, enhanced capability with zero compromise.
With the RBU installed, you’re getting more than a mount—you’re getting a fully integrated sighting system that combines durability, precision, and backup functionality in one package.
Why the RBU Is the Ultimate No-Mill Solution for Glock Owners
Let’s take a closer look at why the no-mill RBU stands out in a crowded market of red dot mounting options:
✅ No Slide Milling Required
Forget sending your slide to a gunsmith. The RBU is a no-mill solution for Glock pistols. Just remove your rear sight and install the mount. It’s quick, easy, and completely reversible.
✅ Built-In Backup Iron Sights
Don’t gamble on your electronics. The Dueck Defense Red Dot Backup Sight features co-witnessed iron sights built right into the mount, ensuring reliability in any condition.
✅ Solid Lock-Up
The RBU is engineered to lock your optic in place using rugged screws and tight tolerances, ensuring that your zero stays zeroed—whether you’re running drills or defending your life.
✅ Built to Last
Machined from high-strength 7075 aluminum and finished to mil-spec standards, the RBU is ready for anything. It’s trusted by law enforcement, military professionals, and serious shooters across the country.
Choosing the Right RBU for Your Glock Pistol
Dueck Defense offers several RBU models, each tailored to specific optics. Here are a few of our most popular configurations:
- 🔧 RBU for Trijicon RMR & SRO: One of our top-selling mounts, trusted by professionals and competitive shooters alike. This RBU is precision-engineered to fit Trijicon RMR and SRO optics securely using your Glock’s factory rear sight dovetail—no slide milling required. It features an integrated backup iron sight for maximum reliability and is nitride-coated for superior resistance to corrosion and wear. Made in the USA and built to perform under pressure.
- 🔧 RBU for Leupold DeltaPoint Pro: Designed for seamless integration with the Leupold DeltaPoint Pro, this RBU offers a crisp sight picture and zero accuracy loss. Its nitride coating ensures resistance to corrosion, rust, and wear, making it a durable choice for your Glock. Installation is straightforward, utilizing the factory rear sight dovetail without the need for slide modifications. Proudly made in the USA.
- 🔧 RBU for Vortex Viper & Venom: This versatile RBU mount is compatible with multiple red dot sights, including Vortex Viper and Venom, Burris FastFire, and others. CNC machined from US Mill-certified bar stock and nitride-coated, it offers high corrosion resistance. The design allows for easy installation using the factory rear sight dovetail, eliminating the need for slide modifications. It’s an excellent choice for those seeking a budget-friendly yet reliable mounting solution.
- 🔧 RBU for Burris FastFire: Tailored for the Burris FastFire series, this RBU mount provides a lightweight and agile solution for everyday carry or dynamic range work. Like other RBU models, it features a nitride-coated finish for enhanced durability and uses the factory rear sight dovetail for installation, avoiding any permanent alterations to your Glock. Made in the USA, it ensures quality and reliability.
Each mount includes detailed installation instructions, and our customer support team is available to answer any fitment or compatibility questions.
Final Thoughts
Red dot optics are the future of pistol shooting, and now you can upgrade your Glock pistol without a slide cut, optic cut, or slide milling. With the no-mill RBU from Dueck Defense, you’ll enjoy the speed, accuracy, and performance of a red dot, along with the reliability of integrated iron sights.
No waiting. No permanent changes. Just performance you can trust.
Explore the full RBU collection now:
Highly recommend upgrading with the RBU if you want a secure, professional, and easily reversible red dot solution. Your Glock deserves the best, and with the Dueck Defense RBU, that’s exactly what you’ll get.