How to Install a Full Auto Sear: A Step-by-Step Guide for Glock Conversions

You’ve bought the full auto sear. Now what? It’s time to turn your Glock into a fully automatic masterpiece — the right way

Why Full Auto Glock Conversions Are in High Demand

With the rise of tactical shooting, viral gun content, and the thrill of full-auto fire, more Glock enthusiasts are exploring legal ways to upgrade their firearms. Whether for range excitement or collection value, installing a full auto sear has become a serious passion project for well-informed gun owners.

But as with any modification, it’s not just plug-and-play. Precision, safety, and legal compliance all matter.

What Is a Full Auto Sear and What Does It Do?

A full auto sear is a small but powerful component that changes your Glock’s firing system from semi-automatic to fully automatic. It overrides the disconnect mechanism, allowing your firearm to fire continuously as long as the trigger is held.

Paired with the right spring tension, it creates a cycle that resets the striker without requiring a full trigger reset — resulting in automatic firing.

Tools You’ll Need for Full Auto Sear Installation

Before we dive into the steps, here’s what you’ll need:

• A compatible Glock (Gen 3 or Gen 4 preferred)
• Your full auto sear or Glock switch (check our store)
• Glock disassembly tool or punch set
• Flathead micro screwdriver
• Safety glasses and gloves
• Loctite (optional for securing components)
• Clean workbench or mat

Full Auto Sear Installation: Step-by-Step Instructions

Important Note: This guide assumes that you are complying with all federal and state laws, including NFA registration. Possessing or installing an unregistered full auto sear is a felony.

Step 1: Safety Check

Ensure your Glock is completely unloaded. Remove the magazine and clear the chamber. Double check.

Step 2: Field Strip the Glock

Disassemble your Glock as you would for routine cleaning:

• Remove the slide
• Take out the recoil spring and barrel
• Set aside

Step 3: Remove the Slide Plate

Using a flathead tool, gently pry off the rear slide plate. This exposes the striker assembly and rear of the slide, where the sear will be mounted.

Step 4: Install the Full Auto Sear

Place the full auto sear over the rear striker mechanism. Depending on the design, this may sit flush or click into place.

• Align the switch with the striker tab
• Test the fit — it should move freely but not wiggle
• Some versions have a locking tab or tension spring

Step 5: Replace the Slide Plate

Slide the backplate into position, compressing the striker assembly as needed. Once secure, ensure that the sear is still in position and functioning smoothly.

Step 6: Reassemble the Glock

Reinstall the barrel and recoil spring, then slide the upper back onto the frame. Function test by pulling the trigger and cycling the slide (without live ammo).

Step 7: Test Fire in a Legal Setting

Take your modified Glock to a certified range or training environment. If NFA-registered, this is your chance to test burst and full-auto performance.

Common Questions About Glock Conversion

Q: Will a full auto sear work on any Glock model?
A: No. Most sears are designed for Gen 3 or Gen 4 Glock 17, 19, 22, or 23 models. Compatibility varies by part.

Q: Can I install the sear myself?
A: Yes, but only if you’re the registered owner under NFA rules. Installation is straightforward with proper tools, but care and legal compliance are critical.

Q: Will this damage my Glock over time?
A: Not if you maintain it properly. Using full auto increases wear on slides and springs, so more frequent inspections are recommended.

What to Avoid During Full Auto Installation

Here are a few common mistakes:

• Installing without registration — Illegal and heavily penalized
• Using a non-compatible Glock — Can lead to malfunctions or damage
• Forcing parts to fit — Precision matters
• Skipping function tests — Always test your build before live fire
• Using low-grade sears — Cheap parts can fail under full-auto stress

Would You Build or Buy Your Full Auto Setup?

Some shooters love the DIY challenge. Others prefer a ready-to-run model. What about you?

Would you rather install your full auto sear at home or buy a pre-built upper?

Ready to Build? AutoSear.org Has You Covered

Whether you’re looking for the best Glock switch, a reliable full auto sear, or just the right parts to start your build, AutoSear.org has what you need.

• Verified quality
• Fast shipping
• NFA-compliant information
• Support for compatibility and installation

Explore our store and get the right components for your full-auto Glock today.

Start shopping here → https://autosear.org/shop/