Glock trigger springs, safety plungers and striker springs

After the connector, three springs and one plunger decide how a Glock trigger feels and whether the pistol fires every time. They cost a few dollars each and take minutes to change, and the wrong combination is the most common way a tuned Glock stops going bang. This guide explains what each part does, the weights sold, what is safe for carry, and which combinations to avoid.

The trigger spring

The trigger spring is a small coil spring hooked between the trigger bar and the trigger housing. It pulls the bar rearward, which means it assists your finger: a heavier trigger spring makes the pull lighter, a lighter one makes the pull heavier. The factory spring is about 5 pounds. An aftermarket 6 pound spring lightens the pull by roughly a quarter to half a pound and slightly softens the reset; a 4 pound spring adds weight and makes the reset snap harder. Trigger springs break more often than any other Glock spring, usually at the hook, and a broken one leaves a trigger that does not return. Keep a spare in the range bag and replace it every few years.

The New York trigger modules

Glock's NY1 and NY2 modules replace the coil trigger spring with a plastic block containing a spring that pushes the bar forward instead of pulling it back, for a heavier, more revolver-like pull with a strong reset. The NY1, olive, gives about 8 pounds with a dot connector; the NY2, orange, gives 11 to 12 pounds. They are agency parts, fitted where policy demands a heavy pull, and they are what some owners fit to a nightstand pistol that a nervous hand might reach. Fit them with the connector Glock specifies; an NY2 with a minus connector is not a factory-approved combination.

The striker spring

The firing pin spring, or striker spring, drives the striker into the primer and is what the trigger compresses during the pull. The factory spring is rated about 5.5 pounds. A reduced-power 4.5 or 4 pound spring lightens the pull noticeably and is the second most popular match change after the connector; it also reduces the energy in the strike. With soft primers it works; with hard primers, some military surplus and some imported ammunition, it causes light strikes, which is why we do not recommend it for a carry or defense pistol. A 6 pound extra-power spring adds a little pull weight and cures light strikes in a pistol that has them.

The firing pin safety plunger and spring

The firing pin safety is a spring-loaded plunger in the slide that blocks the striker until the trigger bar's ramp lifts it during the pull. Lifting it is part of what you feel in the pull, roughly a pound in a new pistol with a rough plunger. The safe way to lighten that is to polish the plunger's bottom and the bar's ramp; the unsafe way is a lighter plunger spring that lets the plunger lift under inertia in a drop. Keep the factory plunger spring. Aftermarket plungers made of polished stainless or titanium reduce friction without changing the spring and are fine.

Safe combinations

Carry: factory or 6 pound trigger spring, factory striker spring, factory plunger spring, minus connector. About 4 to 4.5 pounds.
Range and competition: 6 pound trigger spring, 4.5 pound striker spring, polished plunger, minus or aftermarket connector. About 3 to 3.5 pounds; test with your primers.
Heavy duty or nightstand: NY1 module with dot connector, factory striker and plunger springs. About 8 pounds.
Light strikes with hard primers: 6 pound striker spring, everything else as you had it.

Combinations to avoid

A reduced striker spring with a lighter trigger spring can leave the trigger bar too weak to reset the pistol reliably. A reduced plunger spring is a drop-safety risk at any trigger weight. Any combination below about 3 pounds belongs on a range gun that is never carried, and even there it should be tested with the exact ammunition you shoot. Never mix spring changes with filing or cutting any part; springs are reversible, cuts are not.

Changing them

The trigger spring hooks onto the trigger bar's cruciform and a post on the housing; with the housing out of the frame it changes in a minute. The striker spring is inside the slide: remove the slide cover plate while holding the spacer sleeve, lift out the striker assembly, compress the spring and remove the two spring cups, swap the spring and refit the cups. The firing pin safety plunger drops out of the slide once the striker assembly and extractor depressor plunger are out. Wear eye protection; the striker spring and cups will launch if they slip.

Slimline and large-frame springs

The 43, 43X and 48 use their own shorter trigger spring and a striker spring sized for the slimline striker; the 10mm and .45 large-frame pistols share the standard trigger spring but use their own striker. Buy springs by model, not just by generation. The Gen 5 trigger spring is a coil like the earlier ones but seats on a different bar, and the Gen 5 firing pin safety plunger is larger than the Gen 3 and 4 part, so plungers are generation specific.

Testing

After any spring change, run the function checks: trigger safety, firing pin safety, drop safety on the trigger bar, reset. Then fire at least 100 rounds of the ammunition you will use, and for a carry pistol at least a box of the carry load. A light strike in testing is the pistol telling you the striker spring is too light for that primer; go back up a step. Note the combination and the round count in the pistol's record.

Browse Glock springs and plungers, pair them with the right connector, and read safe pull weights for carry before you tune a pistol that leaves the house.

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