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  /  Firearms   /  A Remodel of the Glock 17 MOS, Part 1

A Remodel of the Glock 17 MOS, Part 1

I recently had the opportunity to fix some problems with a Gen 4 Glock 17 MOS pistol.  The owner advised that he no longer trusted the gun as it was shooting more than one round on trigger press occasionally.

On inspection of the pistol, I found a few immediate problems and determined a path for correction.


The pistol had an aftermarket trigger, and the trigger was missing the internal hinging trigger safety. What does a trigger safety do?  It requires an external force, pressing the trigger safety inward to press the trigger to the rear.  Without this component, inertia created from a fall or blunt force could cause an equal and opposite reaction of the trigger going to the rear and discharging as designed.

Missing Trigger Safety

The owner of the pistol decided to go with the tried-and-true APEX trigger kit upon my recommendations.  There are many options on the market for a Glock pistol, but I know and trust Apex.


A flashlight on a self defense pistol is a wonderful thing.  The Streamlight TLR1HL is a great light but I have seen it fail multiple times at the rear door where you put the batteries in.  Usually, the failure is the plastic top that is clamped to shut the door.  Interestingly, this lights failure was on the door but the whole thing had separated, causing the failure.

Broken Battery Door

I ordered the remote contour switch from Streamlight which created a fix and an improvement of no switches to HAVE to operate, just grip it tight and the light comes on.  The user can still use the momentary or on switch I they desire.


I ordered my parts and once they arrived dove into the pistol to make the changes.  Everything went well until they did not!

With the lower half of the trigger installed, I got to the replacement of the firing pin safety and was stuck!  Usually, you remove the slide cover plate, pull out the striker assembly, remove the extractor depressor plunger assembly, press down on the firing pin safety and the extractor drops out.  You then just simply pull the firing pin safety out, exchange the firing pin safety spring into the new firing pin safety and reassemble.  Not with this pistol though!  The extractor depressor plunger was absolutely STUCK! 

Part 2 coming soon

Be sure to come back for part two of the Glock 19 MOS remodel where I ‘unstuck” the components and then we will make the very needed upgrade of putting on a C&H Precision V4 mounting plate!

Spoiler alert… this thing is going to look sexy and shoot amazing.

About the Author /

Heath has been a law enforcement officer in the Great Pacific Northwest since 1993 and trains as a pistol and rifle instructor for both law enforcement and civilians. He also serves as an advanced armorer on pistols and rifles. If you're looking for training or would like to contact him, he can be reached at

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