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I have recently purchased a freedom

press with solid nose die and boat tail punch

What an experience and the smartest investment I have ever made

I mainly shoot benchrest 100yards and 50m WRABF

I have done the first tests today I was really impressed I still have to tune my for better harmonics

Slug 40.6 gr

Chapter 3 : Passion

Passion.

It’s the thing that keeps you restless, drives you a little crazy, and pushes you right to the edge — in the best way possible.

When GMI was founded, the mission was simple: build the best pellets and slugs we possibly could. Beautiful projectiles come from beautiful dies and tooling, and from day one we were obsessed with creating tooling that was second to none.

Human beings climb mountains and dive into the deepest parts of the ocean. For us, taking GMI from an idea to what it is today felt like our own mountain to climb.

Chapter 2: The Ethos of Die Making

The art of making a die is defined by time. Time spent honing the craft, refining techniques, and learning (and unlearning) every single day. Mastery does not come quickly, and because of that, true trade secrets cannot simply be written in a manual. What can be shared, however, is the ethos behind our work.

Die vs. Mold

A die shapes metals or non-metals by forcing material into a cavity using punches, pins, or pressure.

A mold forms parts by allowing molten material to flow into a cavity and solidify.

The two are often confused—but they are fundamentally different disciplines.

Chapter 1: Measurement units

At GMI, precision starts with how we measure. We build and gauge our dies and punches using metric units, where the smallest increment we work with is a micron—

1 micron = 0.001 mm = 0.000039 inches.

Why does this matter?

Most American die makers work in thousandths (0.001”) or ten-thousandths (0.0001”) of an inch. These are respectable units, but they simply don’t offer the granularity or fine resolution that micron-level measurement provides. No one in the imperial system works in “0.039 thousandths of an inch,” even though that’s what 1 micron actually is.

Today I want to tell you the story the way it actually happened. No marketing, no polished corporate BS. Just the truth, because you deserve it.

Back in 2019, we (two engineers with zero shooting experience) had:

·       No track record

·       Never owned an airgun

·       Never fired a single pellet or slug in our lives

·       No idea we would ever end up in tooling

We warmly invite you to share your real-world experiences right here—whether you’re testing slugs made with GMI kits or any other tooling on the market.

•  If the results are excellent → it’s another proud feather in our cap

•  If something doesn’t perform as expected → it’s a valuable lesson that helps us improve fast

•  If you have a suggestion or idea → we’ll seriously evaluate it and implement whatever is practical

•  If you see any way we (or the wider slug-making community) can do things better → you’re in exactly the right place to speak up

At GMI we have a simple principle - Honesty is the best policy - We take criticism like champions, So feel free.

Thank you all for joining the GMI community. We at GMI engineering welcome you all.

Dear members,

We are excited to launch this dedicated forum as a collaborative space for generating, sharing, and archiving valuable insights from the community on all aspects of PCP airguns and related disciplines.

Key focus areas include (but are not limited to):

• PCP’s, tuning, and performance

• Slug development, testing, and ballistics.

Welcome to the group! You can connect with other members, get updates, share videos, share your experiences and more!

This is the general group on the forum.