Umbra Installation Guide for Shadow Systems

How to Install the Johnny Glocks Umbra Trigger Kit

Welcome to your quick-start guide for installing the Johnny Glocks Umbra Trigger Kit for Shadow Systems pistols. This installation involves both frame and slide disassembly, component replacement, and final safety checks.

⚠️ Before you begin: Always ensure your firearm is unloaded and clear. Safety first.

🛠️ Tools You’ll Need:

Small punch set (for removing shadow systems extractor plunger)
Needle nose pliers or scissors (for zip ties)
0.035 hex wrench (included with purchase)
Small flathead or jeweler’s screwdriver (optional but helpful)

Step 1: Frame Disassembly

Clear the gun and dry fire to break the trigger.
Remove the slide from the frame.
Pop out the pins:
- Rear pin
- Trigger pin
- Locking block pin (can be tricky—wiggle the slide catch if stuck).
Use your tool to lift the locking block.
Pull up the ejector and remove the entire trigger assembly.
Set all parts aside in one spot to stay organized.

Step 2: Slide Disassembly

Locate the notch between the lug face and spacer sleeve and push down lightly.
Apply pressure with your thumb and slide off the backplate.
Carefully remove the striker.
If applicable, remove the optic and optic plate to access the extractor.
Use the included 0.035 hex wrench to remove the extractor plunger stop pin from underneath.
With your thumb over it (to catch spring tension), remove the extractor assembly.
Press the firing pin safety and tap to remove the extractor and safety mechanism.

Step 3: Installing the New Trigger Assembly

Open the package and cut the zip tie holding the parts.
Insert the new trigger assembly into the frame.
Reinstall:
- Locking block
- Rear pin (from either direction)
- Slide catch
- Final pin
Make sure the slide catch pin seats fully. Done! Frame complete.

Step 4: Reassembling the Slide with Umbra Parts

Choose Your Striker Spring:

Green (4 lb): Lightest; smooth, possible light strikes with low-quality ammo.
Orange (4.5 lb): Balanced choice (recommended).
Yellow (5 lb): Heavier break; reliable ignition.

Each spring is color-coded and labeled.

Step 5: Firing Pin Safety Installation

Open the small parts pack.
Insert the spring into the firing pin safety.
Push the assembly into place from the underside of the slide.
Reinstall the extractor—it should capture the firing pin safety.
Apply forward pressure to align the extractor.
Use a longer punch or jeweler’s screwdriver to compress the extractor plunger and drop in the retaining pin.

⚠️ This is the trickiest part. Take your time and apply steady pressure.

Step 6: Installing the Striker Assembly

If using the Johnny Glocks striker, it’s pre-assembled.
If reusing your striker:
- Remove the old spring and spring cups.
- Install your chosen spring.
- Compress and carefully seat spring cups without letting the spring coil get stuck between them.

✅ Important: Misaligned cups or spring ends sitting in the cup seam will cause function issues.

Step 7: Reassembly & Safety Checks

Reinsert the striker assembly into the slide.
Hold the backplate halfway, compress the spacer sleeve, and snap the backplate back into place.
Reinstall the recoil assembly and attach the slide to the frame.

Step 8: Functional Safety Checks

Trigger Safety Check: Pull the trigger without pressing the safety tab—it should not break.
Vertical Extension Test: Pull the trigger shoe forward and press down on the cruciform—it should be solid.
Firing Pin Safety Check: Press it—it should block striker movement unless properly disengaged.

These tests verify that all three passive safeties are working: trigger, drop, and firing pin.

Final Thoughts

Congrats—you’ve just installed your Johnny Glocks Umbra Trigger System!

💬 “This is a full system—each component is refined and weighted to work synergistically. Don’t skip steps or mix and match.”

For more detailed walkthroughs or advanced tuning, check out the Johnny Glocks YouTube channel and follow @johnnyglocks on Instagram.