Glock Troubleshooting Guide

Glock Troubleshooting Guide

Glock 23

Most semi-automatic pistols operate using the same or in a similar method. However, each manufacturer has their own troubleshooting procedures. 

For this Glock Troubleshooting Guide, I have compiled a list of the Glock recommended procedures for troubleshooting the most common issues in the following tables. This is by no means a complete list of troubleshooting steps but is a good starting point for the most common issues that you may encounter. 

A Glock is one of the easiest pistols to work on and we have pleanty of content for you to learn more about this pistol. While you are on our site, don’t forget to check out our Glock Frame Disassembly, Glock Frame Reassembly, Glock Slide Disassembly and Reassembly as well as Glock Field Strip videos to learn more about the Glock pistols. We also have Glock related articles like Tools Used in the Glock Videos, Polymer80 PF940SC completion using a Dremel videoand Polymer80 PF940SC completion using a drill press.

To use the Glock Troubleshooting Guide, locate your problem in the first column of the table, then try the causes starting from the top and working down. If you reach the bottom of the problem and your firearm is still not functioning correctly, you should seek the advice of the Manufacturer or an Armorer that is certified by the manufacturer for that model.  

Glock Troubleshooting Guide Tables

Feeding Issues

PROBLEMPROBABLE CAUSESCORRECTION
Failure to feedMagazine not properly insertedReinsert magazine
Underpowered ammunitionChange ammunition
Dirty magazineClean and inspect magazine
Weak magazine springReplace magazine spring or magazine
Dirty chamberClean the chamber
Tight extractorReplace or clean as needed
Shooting with an unlocked wrist (limp wristing)Lock shooting hand wrist
Deformed magazine (magazine sides or lip deformedReplace magazine
Weak recoil springReplace recoil spring

Extraction and Ejection Issues

Glock Troubleshooting - Extraction and Ejection

PROBLEMPROBABLE CAUSESCORRECTION
Failure to extractExtractor worn, broken or missingReplace the extractor
Defective ammunitionChange ammunition
Dirt under the extraction clawClean the extractor
Dirty chamberClean the chamber
Shooting with an unlocked wrist (limp wristing)Lock shooting hand wrist
Ejection Problems (including stove pipes)Broken or damaged ejectorReplace trigger mechanism housing with ejector
Underpowered ammunitionChange ammunition
Dirty chamberClean the chamber
Shooting with an unlocked wristLock shooting hand wrist
Lack of lubricationLubricate
Dirty gunClean

Firing Issues

PROBLEMPROBABLE CAUSESCORRECTION
Failure to fireSlide out of battery (DO NOT FORCE INTO BATTERY) due to: deformed defective roundInspect and replace round
Under powered ammunitionChange ammunition
Damaged/weak recoil springReplace recoil spring assembly
Damaged recoil spring tubeReplace recoil spring assembly
Mating surfaces of barrel, slide and the receiver excessively dirtyField strip and clean
Gun dirty/obstructed chamberClean chamber
No primer strikeWorn or broken firing pin tipReplace firing pin
Obstructed firing pin channelClear and clean the firing pin channel
Spring cups invertedAssemble properly
Light, centered primer strikeHard primer (SMG ammunition)Change ammunition
Obstructed firing pin channelRemove, inspect and clean firing pin and firing pin spring. Clean firing pin channel
Light off-centered primer strikeTight extractorReplace
Dirty gunClean
Slide lock reversed or not beveledReplace or reinstall the slide lock
Weak recoil springReplace the recoil spring
Inconsistent trigger pull or will not releaseConnector loose in housingReplace housing
Pistol is excessively dirtyField strip and clean
Wrong trigger barReplace
Connector needs lubricationLubricate
Trigger bar is bent or damagedReplace trigger bar
Trigger safety fails to return or engage in the forward positionImproperly stored in original box with trigger in full forward position (trigger safety fully depressed)Replace trigger bar. When stored in original box, pistol must be unloaded, trigger in back position.
Firing pin safety fails as described in the manualDamaged, worn or defective firing pin safetyReplace

Slide Issues

PROBLEMPROBABLE CAUSESCORRECTION
Slide fails to lock open on last roundMagazine follower brokenReplace magazine or magazine follower
Dirty magazineClean and inspect magazine
Weak magazine springReplace magazine spring or magazine
Worn slide stop lever notchContact Warranty Department if the replacement of the magazine and slide stop lever did not correct the issue.
Dirty gunClean
Needs lubricationLubricate
Deformed magazineReplace magazine
Trigger pin inserted too far (left or right) Slide stop lever wornThis can cause the spring on the slide stop lever to bind. Check to see if the slide stop lever moves freely. If no, press the trigger pin slightly to the right until the slide stop lever moves freely.
Slide stop lever damagedInspect and replace if necessary
Underpowered ammunitionChange ammunition
Shooting with and unlocked wrist (limp wristing)Lock shooting hand wrist
Improper gripTighten grip
Failure to fireSlide out of battery (DO NOT FORCE INTO BATTERY) due to: deformed defective roundInspect and replace round
Under powered ammunitionChange ammunition
Damaged/weak recoil springReplace recoil spring assembly
Damaged recoil spring tubeReplace recoil spring assembly
Mating surfaces of barrel, slide and the receiver excessively dirtyField strip and clean
Gun dirty/obstructed chamberClean chamber
Slide loks open earlyImproper hand positionChange grip
Reverse tension on slide stop leverInstall lever correctly and perform field inspection for proper tension.
Damaged slide stop leverReplace

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