Introducing GDI-3D and the Future of HK FRT Lowers

The Missing Link in the HK Legacy

For decades, the HK roller-delayed system has been the "Gold Standard" of firearm engineering. From the MP5 to the G3, these firearms are world-renowned for their reliability and iconic status. But for the modern enthusiast, there has always been a missing link: the ability to run these legendary platforms with the rapid-response capability of a Forced Reset Trigger (FRT).

Today, that changes. Welcome to GDI-3D.

Why GDI-3D?

We didn't start this company just to sell parts. We started it because we are enthusiasts who were tired of seeing the HK platform left behind in the world of Forced Reset Triggers. We saw a community of shooters who wanted more—more speed, more innovation, and more freedom.

Our primary mission is to bring specialized FRT solutions to the HK lineup. We’ve spent countless hours in R&D to ensure that our custom lowers aren't just "functional," but are precision-tuned to the unique timing and physics of the roller-delayed system to accommodate the specific requirements of Forced Reset Triggers.

Specialized for HK, Engineered for All

While our heart is in the HK world, our vision is broader. GDI-3D is a hub for Forced Reset Trigger innovation across multiple platforms.

Whether you are looking for a "plug-and-play" custom lower for your SP5 or searching for Forced Reset Trigger solutions for other firearm systems, we are dedicated to engineering components that are:

• Built to Last: Fiber-Infused Polymer, stainless steel, and high-strength tool steel.
• Ready to Run: Designed for seamless integration and maximum reliability.
• FRT-Optimized: Giving you a tactical edge and a functionality that was previously out of reach for the average citizen.

Current GDI-3D Offerings

We are proud to launch with a lineup that covers everything from tactical heavy-hitters to high-volume plinkers. Our current specialized solutions include:

• USC .45 FRT Lower: Transform your carbine with a dedicated forced reset solution designed for the rugged USC platform.
• UMP .45 FRT Lower: The ultimate upgrade for the UMP enthusiast, bringing high-speed performance to a modern classic.
• TX22 FRT: Bringing the adrenaline of forced reset technology to the rimfire world for high-volume, cost-effective training and fun.
• AR-15 Super Safety (FRT): A precision-engineered forced reset solution for the most versatile rifle platform in the world.

Putting Power Back in the Hands of the People

At the core of GDI-3D is a fundamental belief in the Second Amendment and the right to innovate. We believe that technology shouldn’t be restricted to a select few. By developing Forced Reset Triggers, we are putting the highest level of firearm performance back where it belongs: in your hands.

We are more than a manufacturer—we are a movement of shooters, engineers, and patriots who refuse to settle for "standard."

What’s Next?

This is just the beginning. We are hard at work expanding our lineup and refining our designs to ensure that GDI-3D remains the premier name in Forced Reset Trigger technology.

Ready to reclaim your fire? Explore our current lineup of HK specialty lowers and stay tuned as we roll out new Forced Reset Trigger solutions for other platforms in the coming months.

Sneak Peak: SL8/G36 FRT Lower Coming Soon