Glock G42 Stripped / New Internals


Now that I have vented and had time to cool down about the disappointing aspects of the G42, let’s look at some of the new things going on inside it. The new G42 has several unique, redesigned, internal components, that are very different from all other Glock’s. Right off the bat, you can see it is a 2 pin design, like the old Gen2 Glock’s, with a Gen4 magazine release and stippling.  I have completely stripped this G42 to give you an idea of what the new internal parts are and how they fit in the G42. When completely stripping the G42, you will notice some of the parts will fit together differently as well.  While I will not go into a complete tutorial on how to strip your Glock down, it is not extremely difficult and you can learn how to properly do it with some quality research.

When stripping the G42 completely down, pay close attention to the parts that are significantly different in their design and placement in the G42, compared to other Glock Models . Below are several pictures of a completely stripped G42 and the new internal parts.

Glock G42 complete takedown/stripped
Glock G42 complete takedown/stripped

Slide Stop Lever:

You will need to take the Locking Block out first to remove the Slide Stop Lever, after removing the frame/trigger pin.

Slide Stop Lever in Frame
Slide Stop Lever in Frame
Slide Stop Lever
Slide Stop Lever

Firing Pin Safety:

The Firing Pin Safety is completely different and can only go in one way. The notch on the left side of this picture faces the Firing Pin.

Firing Pin Safety
Firing Pin Safety

Trigger Mechanism Housing, Bar & Spring:

The new Trigger Spring and Trigger Bar will fit together very differently with the Trigger Mechanism Housing. The Trigger Spring has a metal hook that the “T” of the Trigger Bar will need to fit under for reassembly.

Trigger bar / Spring / Mechanism Housing
Trigger bar / Spring / Mechanism Housing


The Connector, although it looks to be identical is much shorter as the Trigger Mechanism Housing is smaller. The standard Glock Connectors will not be compatible.  This answers the questions of those wanting to put a (-) 4 lbs. OEM Connector in the G42. As the Trigger Spring is a redesign, the standard Glock spring options ( NY1) are also not an option.

Trigger Spring/ Connector/ Mechanism Housing
Trigger Spring/ Connector/ Mechanism Housing

The Trigger Spring is more difficult to remove from the housing then the standard Glock Trigger Spring. The housing has a bar and notch system for removing and replacing the Trigger Spring.  While removing it was easy, replacing it was a little hard.

Trigger spring / Mechanism Housing
Trigger spring / Mechanism Housing

Extractor Depressor Plunger:

The Extractor Depressor Plunger is basically the same, but instead of a large flat head, it tapers down to a firing pin look.

Extractor Depressor Plunger
Extractor Depressor Plunger

Final Note:

If you are not a Glock Armorer, Gunsmith or you are very unfamiliar with stripping your Glock down, I would not recommend any disassembly past regular field strip maintenance. Most people will have no need to break the firearm down to this level. 90% of the G42 parts look just like the Glock parts you will be familiar with. When I was stripping the G42, I did not expect some of the parts to fit together so differently. I realized I did not pay as much attention as I should have and it took me a few minutes to get it back together.


For recent part changes Glock has made in new production  G42’s, check out the article linked below. 

Link: Glock Appears to Have Made Changes to the G42

For information on the Glock G43 Single Stack 9mm parts,check out the article linked below. 

Link: Glock G43 Stripped Vs. G42 Internals


  1. Is it necessary to pull the trigger to take this model apart? I notice the report from the NYPD says that detail on other Glocks is involved with most of the unintended discharge incident they have.

    • Yes all Glock’s require the trigger to be pulled for disassembly. Most of the NYPD reports are 20 years old and where identified as training issues. They went from revolvers to Glock’s. The new York (1) and (2) triggers were made to fix negligent discharge issues but this still did not help. A complete retraining of not placing your finger on the trigger until you are ready to fire fixed these issues. If you properly unload your Glock and follow safety rules this is a non-issue.

  2. Thanks! The report I got that from is the latest one 2012 I think. We’ll see what they say when they get a new one out. I wish more cities did a detailed annual report like NY. But, then I wish we knew a lot more about gun injuries. When I was in business, I sure noticed when reports were hard to get it wasn’t because the news was good.

      • It was the 2011 report

        It states on page 48 that 75% for 2011 and 71% since 2007 were Glock 19’s “since 2007, there have been 31 incidents in which officers unintentionally discharged
        their own firearms during loading/unloading, and 22 of those incidents

        71 percent

        involved Glocks. This most likely stems from the fact that a person disassembling a Glock must
        depress the trigger to do so.”

        • Interesting, should say, officers failed to properly unload firearm in those cases. Given the fact that NYPD is one of the biggest departments in the nation with over 34,000 uniformed officers, 31 incidents in 5 years is extreamly low.

          • There’s a lot more than 34,000 Glocks out there in general circulation so the number needs to be extremely low. When I was responsible for safety in a medium size manufacturing operation (not involving guns) I always thought that any operation that could injure persons if a step was skipped or steps were done in the wrong order was unsafe and needed to be redesigned.

  3. I am attempting to remove the Slide Lock Lever to replace it with an Extended Slide Lock Lever.

    I have done this on other Glock models, however the spring to release it on the G42 is not visible.

    Is this now one of those things you were mentioning I should not do because I am not an armorer, or am I just missing something simple?

    • Not sure if you were talking about the slide stop I have pictured (out) above or the slide locking bar. Both have been redesigned and are different than on other Glocks. I wasn’t able to get the slide locking bar out. it too has been redesigned. The spring in it is totally different. I haven’t found anybody who knows, and I’m not sure how to remove it at this time. I would recommend not messing with it, unless you know how to remove it.

      • Easy, peasey: while depressing the slide locking lever, merely bush it out the opposite side. The tiny spring underneath should remain in its socket. When replacing the extended lever, angle it over the depressed spri7n, depress it g & shove it back into place. Not sure why it took me so long to figure this out’1

  4. Got the new upgrade version G-42. Disassemble it all the way down to clean and light oil before shooting it. The only thing I didn’t mess with was the trigger spring. I shoot strings of five rounds at fifteen ft. I’m a 1911 shooter, so the transition to the Glock trigger has been a bit; shell we say different.
    So far one hundred rounds and no hiccups. I know its not a target pistol, but would like to put all six rounds in the nine or ten space of target. My impression of the G-42, very reliable and user friendly.

  5. I just bought my wife a G42 sometime no eject some times double feed an mine has all the 1 markings on it have they come out with somthing different

    • trigger spring rod is upside down in your photo. mine is flat side up, new g43 is also flat side up and brownells replacement is flat side up.trigger will not reset with flat side down.

  6. Thanks. Had my G43 apart. Needed to check the way the trigger bar cross lipped under the spring. The manual is… somewhere. (My G43 flawless after 600 rounds. Very accurate with Federal 9BP)

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