Swapping a Polymer80 trigger: tools, steps and safety checks

Changing the trigger on a Polymer80 pistol is a bench job that takes fifteen minutes the second time you do it and an hour the first. The parts follow the Gen3 Glock pattern, so the steps are the same ones described in every Glock armorer's course. This guide lays them out in order, explains the choices you will make along the way and finishes with the function checks that matter. It is general information; if anything here does not match what you see in your pistol, stop and ask a gunsmith. We are not affiliated with Polymer80 or Glock, and nothing here should be read as a recommendation to make a defensive pistol lighter than you can control.

Before you start: what are you changing

Connector only: the smallest change and the most common. A minus connector drops the pull about a pound.
Trigger spring or striker spring: a heavier trigger spring lightens the pull slightly; a lighter striker spring lightens it more but risks light primer strikes. Keep the factory striker spring on a carry gun.
Trigger shoe and bar: changes the feel and the finger position; flat shoes are popular.
Complete drop-in kit: shoe, bar, connector, housing and springs together; the biggest change and the one to test the hardest.

Tools

A 3/32-inch steel punch, a small hammer or nylon mallet, a plastic bench block with a hole, a small flat screwdriver, and good light. A parts tray keeps the pins from rolling away. No vise needed.

Step one: unload and strip

Remove the magazine, lock the slide back, look and feel in the chamber, and put all ammunition in another room. Point the pistol in a safe direction, press the trigger, pull the slide back a quarter inch, pull down both slide lock tabs and run the slide off the front. Set the slide aside; the trigger work is all in the frame.

Step two: remove the pins

Push the trigger housing pin (the rear one) out from left to right with the punch. Then the locking block pin (the upper front pin), then the trigger pin. The trigger pin can be tight because the slide-stop lever spring bears on it; wiggle the lever while pushing. Lift out the slide-stop lever and the locking block.

Step three: remove the trigger group

Pry the trigger housing up from the rear with the screwdriver and lift it out with the trigger bar attached. Unhook the trigger spring from the bar, then unclip the bar from the housing by rotating it; the connector slides out of the housing toward the rear. You now have the trigger with bar, the housing with ejector, the connector and the spring on the bench.

Step four: fit the new parts

Seat the new connector in the housing with its angled tab facing outward, the way the old one sat. Hook the trigger spring to the housing and to the bar, with the spring's open hooks positioned as the old ones were, so it does not pop off later. Clip the bar back onto the housing. If you are installing a full kit, follow the maker's orientation notes; some kits use a different spring arrangement.

Step five: reassemble

Drop the trigger group into the frame, trigger first, and seat the housing. Set the locking block in place and the slide-stop lever on top of it with the spring wire under the locking block. Push the trigger pin in from right to left through the lever and the trigger, then the locking block pin, then the trigger housing pin. Pins should be flush on both sides. Reinstall the slide.

Step six: function checks, every time

Trigger safety: with the pistol empty, press the trigger from the side without depressing the safety tab; it must not move.
Striker release and reset: rack the slide, press the trigger and hear the striker fall; hold the trigger, rack again, release slowly and feel the reset click.
Firing-pin safety: remove the slide, push the striker forward from the rear; it must be blocked by the plunger until you press the plunger down.
Slide lock-back: insert an empty magazine and rack; the slide must lock back and release with the lever.
Drop safety: not something you test at home; it depends on the trigger bar and cruciform geometry, which is why untested bargain kits are a bad idea.

Range confirmation

Fire fifty rounds of practice ammunition, then at least a hundred rounds of the ammunition you keep in the pistol, with every magazine you own. Any light strike means the striker spring is too light for your primers; put the factory spring back. If the pistol doubles or fires on release, stop immediately and remove the kit.

What not to change

Do not file, polish or bend the cruciform tail of the trigger bar or the sear surfaces of the striker. Do not remove the trigger safety tab or the firing-pin safety plunger. Do not stack a light striker spring with a light connector on a pistol you carry. A pull in the 4- to 5.5-pound range with a clean break is the goal for a defensive gun; lighter belongs on the range.

Keep the old parts

Bag the factory connector, spring, trigger and bar and label them. They return the pistol to stock for warranty questions, resale or a change of mind. Our small parts guide names every piece you just handled; the compatibility guide covers which Glock parts fit; and the catalog has triggers and connectors that ship to your door.

General information, not legal advice. Current as of September 2026. Laws change; check the official source before you act.