Description
Building or rebuilding a Glock slide takes more than just a barrel and a spring. This Zaffiri Precision Upper Parts Kit rounds up every small internal part your Glock 17 Gen 5 slide needs to actually cycle, fire, and extract the way it was designed to, all sourced from a US manufacturer and machined to original spec so fitment isn't a guessing game.
Why This UPK Matters for Your Glock 17 Gen 5 Build
A bare slide is just a chunk of metal until it has a firing pin, extractor, and the handful of small springs and pins that make everything work together. This kit gives you that missing piece of the puzzle, whether you're finishing a stripped aftermarket slide from Zaffiri Precision or another compatible manufacturer, or replacing worn internals on a slide that's seen a lot of rounds. It's built specifically for the Gen 5 pattern, which uses different internals than earlier generations, so you're not stuck trying to force a part that's close but not quite right.
What Comes in the Zaffiri Precision Upper Parts Kit
Inside you'll find the firing pin and firing pin spring, spacer sleeve, spring cups, a nitride-treated firing pin safety with its spring, the extractor along with the extractor depressor plunger and spring, a spring loaded bearing, firing pin channel liner, and the slide cover plate. This particular Gen 5 kit also includes the recoil spring assembly, so you're not left sourcing a guide rod separately before your slide is ready to run.
Fit and Compatibility
This kit is cut specifically for Glock 17, G17L, and G34 pistols built on the Gen 5 frame and slide pattern. Gen 5 parts have their own dimensions compared to Gen 1 through Gen 4, so this kit will not drop into an older generation slide. Every component is finished in black to match factory and most aftermarket coatings, keeping the look clean once everything is buttoned up.
Key Specifications
- Manufacturer: Zaffiri Precision
- Manufacturer Part Number: UPK-G17G5
- UPC: 810220065181
- Compatibility: Glock 17 / G17L / G34 – Gen 5 only
- Color / Finish: Black
- Model: UPK
- Product Type: Kit
- Country of Origin: Made in USA
- Recoil Spring Assembly Included: Yes
- Slide Cover Plate Material: Aluminum
What’s Included
- Firing pin (striker)
- Firing pin spring
- Firing pin spacer sleeve
- Spring cups (2-pack)
- Firing pin safety, nitride, with spring
- Extractor
- Extractor depressor plunger, nitride, with spring
- Spring loaded bearing
- Firing pin channel liner
- Slide cover plate
- Recoil spring assembly (guide rod)
Frequently Asked Questions
Will this Upper Parts Kit fit my Glock 17 Gen 4?
No, this kit is machined specifically for the Gen 5 pattern and will not properly fit a Gen 1 through Gen 4 Glock 17 slide. Zaffiri Precision makes a separate kit for those earlier generations, so double check your slide's generation before ordering.
Does this kit come with the guide rod?
Yes, this Gen 5 kit includes the recoil spring assembly along with the rest of the internal parts, so you won't need to buy a guide rod separately to get your slide running.
Can I use this kit on a Glock 34 or G17L Gen 5?
Yes, this kit is designed to work across the Glock 17, G17L, and G34 Gen 5 models since they share the same slide platform. Just make sure whatever slide you're building on is confirmed Gen 5.
Do I need a gunsmith to install this upper parts kit?
Plenty of people install these themselves with a punch set, some patience, and a good video reference, since the parts are fit to factory spec. That said, if you're not comfortable with detail stripping a slide, having a gunsmith handle it removes any guesswork.





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