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Zaffiri Precision Premium Upper Parts Kit (UPK) - Fits Glock 17 / 34 / 17L Gen 3 Slide Assemblies - Stainless Steel & Hardened Polymer Internal Components - UPK-G17G3
Product Description
If you are gathering the components to finish a bare aftermarket slide or refresh a well-worn factory build, buying loose internal pins and springs piecemeal can cause serious head-scratching. Mixing parts from random budget brands often leads to stacked tolerance issues, resulting in light primer strikes, gritty trigger pulls, or an extractor that binds up during cycling. The **Zaffiri Precision Premium Upper Parts Kit (UPK-G17G3)** bundles every single internal spring, plunger, and clip you need into a single high-quality package, ensuring your build functions seamlessly right off the bench.
Every piece in this kit is manufactured to meet or exceed original factory specifications, with critical small items machined from high-strength stainless steel and hardened polymers. The kit centers around a heavy-duty steel firing pin assembly and premium striker spring designed to snap forward smartly and deliver consistent, reliable ignition across all primer types. It is paired with a precision-ground safety plunger, a crisp extractor spring bearing set, a standard-weight captured recoil guide rod assembly, and a durable polymer channel liner to protect the internal slide walls from metal-on-metal wear.
Instead of guessing if your loose parts match up properly, this kit provides a complete, drop-in internal overhaul. It is the perfect choice for anyone finishing a Polymer80 build, wrapping up a custom Zaffiri ported slide setup, or simply restoring original factory cycling reliability to an old Gen 3 favorite.
*Armorer Bench Notes & Real-World Installation Guidance: This Zaffiri Precision Upper Parts Kit arrives complete with all internal small parts organized in separate compartments within its factory package. FRAME & GENERATION COMPATIBILITY DIRECTIVE: This specific component array is engineered natively to fit Glock 17, Glock 34, and Glock 17L Gen 3 full-size slide architectures only. It is 100% compatible with OEM Glock Gen 3 slides, Zaffiri Precision custom slides, Polymer80 builds, and custom 3D-printed layout variants. It will not interchange with Gen 4 or Gen 5 slides due to generation-specific design changes to the safety plunger geometry, back plates, and dual-stage recoil spring dimensions. Armorer Workbench Assembly Sequence: 1. Always use a dedicated channel liner tool to press the polymer channel sleeve into the bare slide pocket completely straight—forcing it in at an angle can warp the liner and cause firing pin drag. 2. When assembling the firing pin safety spacer sleeves (the small plastic halves), make sure they seat evenly over the spring lip. 3. Ensure the metal spring bearing at the tail end of the extractor rod is facing outward toward the slide backplate. Lubrication Parameter: Keep the inside of the firing pin channel liner completely dry. Spraying oils or grease inside the striker channel traps burnt powder residue and fine lead dust, creating a sludge that will bog down spring speed and lead to light primer strikes downrange.*
Key Features
- Complete Internal Component Array: Provides every necessary small part, plunger, and spring required to fully populate a bare full-size Gen 3 slide without missing pieces.
- Heavy-Duty Striker Core: Outfitted with a premium stainless steel firing pin assembly to ensure clean vertical strikes and positive primer ignition.
- High-Tensile Springs Pack: Features factory-calibrated spring rates across the striker, safety plunger, and extractor assemblies to maintain crisp timing.
- Turnkey Captured Guide Rod: Includes a standard-weight stainless steel guide rod with a pre-captured recoil spring, saving you assembly steps on the bench.
- Self-Lubricating Channel Liner: Outfitted with a slick polymer sleeve designed to line the inner slide walls, preventing spring scraping and internal wear.
- Perfect Match-Grade Fit: Engineered to match original factory spec clearances precisely, completely eliminating stacked tolerance jams.
Product Specifications
- Brand: Zaffiri Precision (Largo, Florida)
- Model Line: Factory Premium Slide Internal Component Overhaul Series
- MPN/SKU: UPK-G17G3 (Also cataloged as UPK-G17G13 or ZAF-UPK-G1734-GEN3)
- UPC Code Profile: 810220065204
- Firearm Model Fitment: Glock® 17, 34, 17L Gen 3 Slides & Exact Spec Custom Variations (P80 Full-Size)
- Striker Pin Base Material: Premium Ground Stainless Steel Core Billet
- Spring Composition Standard: High-Tensile Tempered Spring Steel Wire
- Recoil Guide Rod Style: Stainless Steel Captured Rod with Standard Factory Weight Spring
- Channel Liner Profile: Injection-Molded Low-Friction Black Polymer Cylinder Sleeve
- Compatible Cartridge Caliber: 9x19mm Parabellum (9mm Luger / 9mm NATO)
- Full Kit Component Checklist: Firing Pin, Striker Spring, Spacer Sleeves, Spring Cups, Safety Plunger, Plunger Spring, Extractor Depressor Rod, Spring Bearing, Extractor Spring, Slide Cover Plate, Channel Liner, Recoil Guide Rod Assembly
- Packaging Format Class: Zaffiri Precision Multi-Compartment Factory Bag/Box Pack
- Product Type Category: Handgun Small Parts / Slide Internal Assembly Kits
- Overall Fitment Class: Full-Size Duty Slide Internals
- Net Kit Assembly Weight: ~2.45 Ounces (Total combined small parts mass)
- Country of Manufacture: Proudly Made in the United States of America
- Warranty Tracking Protection: Fully Backed by Zaffiri Precision Materials Guarantee
