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A stripped slide looks great sitting on the bench, but it's just a hunk of machined steel until it gets its guts back. That's exactly what this Zaffiri Precision UPK is built to solve. It packs every small part your Glock 43X or 48 slide needs to actually run: firing pin and spring, spring cups, safety plunger and spring, a complete extractor with loaded chamber indicator, the extractor depressor plunger assembly, the slide recoil cover plate, and a full recoil spring assembly with guide rod. Nothing extra to hunt down afterward, and nothing missing that'll leave you digging through a parts bin at the range.
Every piece in this kit is made in the US and cut to the same tolerances as the original factory components, so there's no fitting, filing, or fighting to get things seated right. That matters more than people realize on the slimline platform, since these guns run a slightly different geometry than the standard-size Glocks. This kit is built specifically around the 43X and 48, and it won't cross over to other generations or models, so keep it in that lane.
Whether you're finishing off a Zaffiri slide, a Polymer80, or another compatible aftermarket 43X/48 slide, this kit is what turns that empty shell into a working upper. It's also a smart pickup if your factory internals are getting tired or you just want fresh springs and a clean extractor in an older carry gun. The extractor includes the loaded chamber indicator setup Glock owners are used to, so you keep that same tactile chamber check you'd get from a factory gun.
This is not a snap-together kit for someone who's never had a slide apart before. Getting the firing pin channel, safety plunger, and extractor seated correctly takes a steady hand and the right punches, so if you're newer to Glock internals it's worth having an experienced builder or gunsmith handle the install. Once it's in, though, you've got a slide that runs like it came from the factory, built with parts meant to hold up over the long haul rather than just get you through a range day.
This particular kit is built specifically for the Glock 43X and 48. The slimline platform has its own dimensions, so parts sized for it won't drop into other Glock generations or models.
In most cases yes, since it's machined to original spec tolerances for the 43X/48 platform. That said, aftermarket slides from different manufacturers can have slightly different tolerances, so it's worth double checking fit with the slide maker if you're running something outside of a factory or Zaffiri slide.
No, this UPK covers the internal slide parts only, firing pin, extractor, springs, cover plate, and guide rod. You'll need to source a barrel separately to finish the build.
It's doable if you've worked on Glock internals before and have the right punches on hand, but the firing pin channel and extractor depressor assembly take some care to seat correctly. If this is your first slide build, having a gunsmith handle the install is the safer bet.
| UPC | 810220065211 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | UPK-G4348 |
| Color | Black |
| Model | |
| Product Type | Kit |
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