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Zaffiri Precision
The Zaffiri Precision UPK (Upper Parts Kit) for Glock Gen 1-4 is a complete internal upgrade solution for custom Glock builds and slide projects. This kit supplies all the small parts and springs needed to finish your slide assembly—everything except the guide rod and recoil spring assembly—making it ideal for gunsmiths and experienced builders working with Glock 19, 17, 17L, 26, and 34 platforms across generations 1 through 4. Every component is manufactured in the US to match OEM Glock tolerances and specifications, so you get reliable function without compromise.
Whether you're assembling a custom slide from another manufacturer or refreshing the internals of a well-used frame, this kit takes the guesswork out of sourcing individual parts. Zaffiri Precision engineers each piece to fit and function just like factory Glock components, but sourced and QC'd as a matched set. The inclusion of both spring cups, the firing pin channel liner, and a nickel-plated aluminum slide cover plate means you're getting a comprehensive package—not a pile of orphaned springs and pins.
Installation requires gunsmith-level competency; this is not a drop-in DIY upgrade for new shooters. Once installed by someone who knows what they're doing, you'll have a solid, properly functioning upper assembly. Keep in mind that this kit does not include the guide rod or recoil spring assembly, so you'll need to source those separately or retain them from a donor slide.
| Brand | Zaffiri Precision |
| Compatibility | Glock 19, 17, 17L, 26, 34 (Gen 1-4) |
| Kit Type | Upper Parts Kit (no guide rod) |
| Manufacture Origin | US |
| Installation | Gunsmith-level competency required |
This kit is compatible with Glock 19, 17, 17L, 26, and 34 across generations 1, 2, 3, and 4.
No. The guide rod and recoil spring assembly are not included in this UPK. You will need to source or retain these separately.
The kit includes: firing pin, firing pin spring, spacer sleeve, two spring cups, firing pin safety, nitride-finished extractor, depressor plunger, depressor plunger spring, spring-loaded bearing, firing pin channel liner, and an aluminum slide cover plate.
This kit is designed for installation by a competent gunsmith. It is not recommended for inexperienced users. Improper installation can result in malfunction or safety issues.
Zaffiri Precision
The Zaffiri Precision UPK (Upper Parts Kit) for Glock Gen 1-4 is a complete internal upgrade solution for custom Glock builds and slide projects. This kit supplies all the small parts and springs needed to finish your slide assembly—everything except the guide rod and recoil spring assembly—making it ideal for gunsmiths and experienced builders working with Glock 19, 17, 17L, 26, and 34 platforms across generations 1 through 4. Every component is manufactured in the US to match OEM Glock tolerances and specifications, so you get reliable function without compromise.
Whether you're assembling a custom slide from another manufacturer or refreshing the internals of a well-used frame, this kit takes the guesswork out of sourcing individual parts. Zaffiri Precision engineers each piece to fit and function just like factory Glock components, but sourced and QC'd as a matched set. The inclusion of both spring cups, the firing pin channel liner, and a nickel-plated aluminum slide cover plate means you're getting a comprehensive package—not a pile of orphaned springs and pins.
Installation requires gunsmith-level competency; this is not a drop-in DIY upgrade for new shooters. Once installed by someone who knows what they're doing, you'll have a solid, properly functioning upper assembly. Keep in mind that this kit does not include the guide rod or recoil spring assembly, so you'll need to source those separately or retain them from a donor slide.
| Brand | Zaffiri Precision |
| Compatibility | Glock 19, 17, 17L, 26, 34 (Gen 1-4) |
| Kit Type | Upper Parts Kit (no guide rod) |
| Manufacture Origin | US |
| Installation | Gunsmith-level competency required |
This kit is compatible with Glock 19, 17, 17L, 26, and 34 across generations 1, 2, 3, and 4.
No. The guide rod and recoil spring assembly are not included in this UPK. You will need to source or retain these separately.
The kit includes: firing pin, firing pin spring, spacer sleeve, two spring cups, firing pin safety, nitride-finished extractor, depressor plunger, depressor plunger spring, spring-loaded bearing, firing pin channel liner, and an aluminum slide cover plate.
This kit is designed for installation by a competent gunsmith. It is not recommended for inexperienced users. Improper installation can result in malfunction or safety issues.
