GMI engineering
Built by Engineers. Trusted by Precision Shooters Worldwide.​
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GMI Engineering is a die and tool-making company specializing in cold forming, swaging dies, and precision tooling for serious PCP shooters, custom slug makers, and small commercial producers.
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We were founded with one obsession: building swaging dies that perform to tolerances most manufacturers will not attempt. As precision engineers and tool makers, we saw a clear gap in the global airgun market — customers needed dies made to genuine engineering standards, not catalog approximations.
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Every die that leaves our facility is precision-machined, carefully finished, and verified for fit, function, and consistency. We are passionate about the craft of creating dies and molds, with an obsession for micron-level precision. In precision shooting and slug production, the barrel does not forgive poor alignment, inconsistent sizing, or careless manufacturing.
Our caliber range runs from .177 to .457, covering everything from competition field target shooting to big-bore airgun applications and commercial slug production. Whether it is a single custom die or a complete slug-making system, our focus remains the same: accuracy, repeatability, and long-term performance.
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At GMI, we believe the ability to make something on your own is a powerful expression of freedom, self-reliance, and enterprise. That belief is at the heart of every tool we design. Our products are built not just to make slugs, but to help people create, experiment, improve, and even build their own precision slug-making businesses.
Over the years, GMI Engineering has earned the trust of more than 400 customers across the USA, Europe, Australia, and beyond. We are proud to support more than 10 individuals who now swage and run their own precision slug-making businesses using GMI tools.
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Our SlugMaster kit carries patent-pending status for its auto-bleed and adjustable hollow-point system — innovations developed from real shooter feedback and practical production needs, not from what was easiest to manufacture.
We deeply respect the hard work, dedication, and ambition of our customers. Whether you want to become more self-reliant, improve your shooting performance, or start your own slug-making business, GMI Engineering has the tools, experience, and support to help you move forward.
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Reach out to us on WhatsApp or by email, and you will find people ready to guide you every step of the way.
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We do not build products for noise or hype. We build precision tools for people who understand results.
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At GMI Engineering, innovation does not stop — and the steel speaks for itself.