Zaffiri Precision 17.5.UPK Upper Parts Kit for Glock 17/34 Gen 5

The Zaffiri Precision 17.5.UPK Upper Parts Kit for Glock 17/34 Gen 5 is a complete component set designed to simplify building or refreshing a custom Glock upper receiver. Whether you're assembling a Gen 5 Glock 17 or 34 from a stripped slide or replacing worn internals, this kit delivers all the precision parts you need without hunting down individual components. Each part is manufactured to tight tolerances that match OEM specs, so you get reliability without surprises.

Zaffiri Precision specs every component in this kit to Gen 5 tolerances—it won't work with earlier Glock generations, so confirm your platform before ordering. The kit bundles both the small springs and pins (firing pin spring, firing pin safety spring, extractor depressor plunger spring, and their corresponding spacer sleeves and cups) plus the larger wear items like the extractor, firing pin safety, spring-loaded bearing, and slide cover plate. The centerpiece is an upgraded stainless steel recoil spring assembly loaded to OEM spring weight, so you get the same reliability as factory without compromising feel or function.

All parts are made in the USA to exacting standards, which matters when you're building a defensive or duty pistol or just want tight, predictable performance at the range. This is the kind of kit that saves time and money compared to sourcing everything piecemeal, and Zaffiri's reputation for precision machining means you're not gambling on fit or durability.

Key Features

• Complete upper parts kit for Glock Gen 5 builds—17 and 34 models
• Includes all springs, pins, safeties, extractor, firing pin, and recoil spring assembly
• Upgraded stainless steel recoil spring assembly at OEM spring weight
• Precision machined to tight OEM tolerances
• All parts manufactured in the USA
• Gen 5 specific—not compatible with other Glock generations

Specifications

Frequently Asked Questions

Will this kit work on my Glock Gen 3 or Gen 4?

No. This upper parts kit is engineered specifically for Gen 5 Glock 17 and 34 models and is not compatible with any earlier generation.

What parts are included in this kit?

The kit contains the firing pin, firing pin spring, firing pin safety, firing pin safety spring, extractor, extractor depressor plunger and spring, spring cups, pin spacer sleeves, spring-loaded bearing, firing pin channel liner, slide cover plate, and a stainless steel recoil spring assembly.

Can I use this to complete a stripped Gen 5 Glock slide?

Yes. This upper parts kit supplies all the internal components needed to finish a Gen 5 17 or 34 stripped upper receiver.

Is the recoil spring the same weight as the factory spring?

Yes. The upgraded stainless steel recoil spring assembly in this kit is loaded to OEM spring weight.