Zaffiri Precision upper parts kit (UPK) for Glock 19 Gen 4 pistols — every internal component needed to populate a stripped Gen 4 slide. Parts are made in the USA and machined to the exact Gen 4 spec, so a custom or OEM Gen 4 slide drops in and function-tests on the first try.
Gen-4 specific: the Gen 4 firing pin channel, extractor, and depressor plunger geometry differ from both Gen 3 and Gen 5 pistols. This kit will not fit Gen 3 or Gen 5 G19 slides — order the corresponding Gen 3 UPK or a Gen 5-specific completion kit for those.
Fits: Glock 19 Gen 4. Also compatible with G17 Gen 4 stripped slides that share the same striker channel and extractor footprint.
Kit contents:
Pair with a Gen 4 barrel, sights, and captured guide rod assembly to finish the build. Function-check dry before live-fire.
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