Building your own Geisler Defence 19x is more than just assembling a firearm—it’s about upholding the tradition of the Second Amendment. By crafting your own 80% build, you’re taking part in the proud history of responsible gun ownership and self-reliance.
This guide will take you through each step of the process, from preparing the frame, removing the tabs, clearing the guide rod channel, and drilling perfectly aligned holes. Whether you’re a seasoned builder or tackling your first project, these Geisler Defence 19x build instructions will help you finish your build.
Grab your tools, clear your workspace, and start building your 80% Geisler Defence 19x!
Quick Jump
Geisler Defence Build Tools
Below are the recommended and optional tools for completing your Geisler 19x. If you are looking for more suggestions about which tools to purchase, check out our Geisler Defence 19x recommended build tools post.
- Cordless Hand Drill
- End Nippers
- X-Acto Knife
- Dry Sandpaper
- Wet Sandpaper
- Dremel (Optional)
- Files (Optional)
Geisler Defence 19x Video Instructions
Geisler Defence 19x Step-by-Step Instructions
In this section, we’ll guide you through the complete step-by-step process of building your Geisler Defence 19x.
Step 1 – Removing the Tabs
The first step in your build is removing all four tabs from the frame. This includes the two tabs near the rear rail area and the two tabs by the locking block. For this, you can use tools like end-snips, 3D filament cutters, or an X-Acto knife.
If you choose to use a Dremel tool, exercise caution to avoid removing too much material. It’s best to leave a small amount of tab material, as the final finishing will be done by hand sanding to ensure precision.
Step 2 – Recoil Assembly Channel Removal
Removing the recoil assembly channel tab is one of the more challenging steps in your Geisler build. Start by cutting a “V” shape into the plastic using an X-Acto knife or box cutter.
You can also use a Dremel, but be sure to use a small attachment to avoid removing too much material or damaging the sides. Keep the two raised tabs along the frame intact.
To ensure proper function, remove material until the bottom of the “U” is flush with the rest of the frame. Finish the job using a circular file or 80-grit sandpaper for a smooth, precise finish.
Step 3 – Dremmal & Sanding
If you’ve made it this far, give yourself a pat on the back! Now, you’re onto one of the easier but most time-consuming steps.
This phase involves more Dremel work (if available) and a lot of hand sanding. Break this process into smaller steps, increasing the grit of the sandpaper as you progress.
You’ll need to sand all four tabs and the recoil assembly channel in a consistent, round-robin fashion. Here’s my recommended approach using the following sandpaper grits:
Dry Sandpaper:
- 80 Grit
- 120 Grit
- 220 Grit
- 400 Grit
Wet Sandpaper:
- 1200 Grit
- 2000 Grit
These grits are guidelines, and while you can use slightly different options, the key is gradually increasing the grit for a smoother finish.
Step 4 – Drilling
If you’ve made it this far, congratulations—you’re almost finished building your Geisler!
Next, place the frame into the jig, ensuring it’s seated firmly. Insert the three bolts and secure them with the nuts on the opposite side. Tighten the jig securely, but be careful not to overtighten and risk damaging the jig or stripping the bolts.
The jig has raised indexes to help keep the drill bit straight, but you’ll still want to ensure the bit is centered and goes through the material as straight as possible.
When drilling, avoid going through both sides at once. Drill one side, then flip the jig and drill the other. The Geisler package includes two bits—an M3 and an M4. The M3 is used for one hole near the locking block and another near the rear rail. The M4 is used only for the trigger area, and the jig hole sizing makes it easy to differentiate between the two.
Take your time with this step to ensure smooth installation of the lower parts and slide kit later on.
Next Steps & Final Geisler Assembly
Great work on building your own Glock 19x-style pistol!
Now, the final step is installing the lower parts kit and slide assembly. You can watch our video on installing the lower parts kits here:
If you don’t have the parts yet, you can purchase one of our Geisler-compatible lower parts kits here and follow our detailed installation instructions.
Husky Armory also offers a budget-friendly, thoroughly tested Geisler slide kit available here. These slide kits are 100% built and ready to slide on to your frame.
For those who only have the frame and want everything in one go, check out our complete Geisler Defence 19x Completion Kit here to easily finish your build.
Your Geisler Defence 19x Journey
Congratulations on making it through the Geisler Defence 19x build! From prepping the frame and removing tabs to drilling precision holes, you’ve successfully taken on the challenge of building your own firearm—upholding a proud tradition of craftsmanship and the Second Amendment.
Not only have you constructed a reliable and customized pistol, but you’ve also gained the skills and confidence to tackle future builds. Whether you’re planning upgrades or looking for your next DIY project, you’re now part of a community of builders who value both self-reliance and precision.
Remember, the quality of your build lies in the attention to detail—so if you haven’t already, don’t forget to install your lower parts kit and slide assembly. For more tools, kits, or future projects, Husky Armory is always here to support your journey.
Now, take pride in your work, hit the range, and enjoy the fruits of your labor with your custom Geisler Defence 19x!
