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Zaffiri Precision Premium Upper Parts Kit (UPK) - Fits Glock 19 Gen 5 Slide Assemblies - Stainless Steel & Hardened Polymer Internal Components - UPK-G19G5
Product Description
When you are building a blank aftermarket slide or completely refreshing a high-mileage compact carry gun, trying to gather loose internal springs and tiny pin assemblies piece by piece is an easy way to end up with assembly errors. Mixing random small parts from mystery brands often introduces tolerance stacking issues, resulting in annoying light primer strikes, rough slide drag, or an extractor that hangs up on chambered casings. The **Zaffiri Precision Premium Upper Parts Kit (UPK-G19G5)** packs every vital internal spring, plunger, and clip into a single high-quality kit, ensuring your modern Gen 5 compact slide assembly works flawlessly from the very first rack.
Every small component in this kit is manufactured to meet or exceed original factory engineering standards, utilizing high-strength stainless steel and hardened polymers where it matters most. The package features a heavy-duty steel Gen 5-specific striker pin and premium spring to ensure crisp, hard primer ignition across all ammunition types. It is bundled with a rounded Gen 5 safety plunger wedge, an extractor depressor rod assembly, a standard-weight captured compact recoil spring assembly, and a durable channel liner to prevent internal spring scraping against your slide's core walls.
Rather than guessing if your loose parts are fully compatible, this complete kit delivers an instant, drop-in internal overhaul. It is the perfect choice for completing a custom Zaffiri compact slide build, finishing a high-end custom polymer frame project, or returning crisp, out-of-the-box reliability to your favorite Gen 5 compact pistol.
*Armorer Bench Notes & Real-World Installation Guidance: This Zaffiri Precision Upper Parts Kit arrives organized with all internal small parts securely packaged within its factory container. CRITICAL GENERATION-SPECIFIC COMPATIBILITY DIRECTIVE: This component selection is engineered natively to fit Glock 19 Gen 5 slide architectures and direct compact family equivalents (like the Glock 45 and 19X) only. Because Glock completely overhauled the firing pin assembly, back plate shape, safety plunger geometry (moving from a cylinder to a rounded wedge), and recoil spring footprint for Generation 5, these parts will not fit older Gen 3 or Gen 4 compact slides. Armorer Workbench Assembly Sequence: 1. Always use a dedicated channel liner tool to tap the polymer channel sleeve straight into the slide pocket—forcing it in crooked can warp the sleeve and cause a sluggish firing pin. 2. When locking the firing pin spring cups together over the striker spring tail, ensure they are seated completely flush before releasing tension. 3. Ensure the small spring bearing at the base of the extractor rod faces outward to correctly support your slide backplate. Lubrication Parameter: Keep the inside of the striker channel liner completely dry. Spraying oils, liquid lubes, or grease inside the firing pin track collects loose powder soot and gun dust, creating a sticky paste that slows down the striker and triggers light primer strikes downrange.*
Key Features
- Complete Gen 5 Compact Array: Delivers every single necessary small part, spring, and plunger required to fully populate a bare Gen 5 compact slide without missing components.
- Gen 5 Optimized Firing Pin: Outfitted with a premium stainless steel striker assembly engineered natively to interface with modern Gen 5 trigger bars.
- Smooth Rounded Safety Plunger: Includes the updated Gen 5 wedge-shaped safety plunger to provide a cleaner, noticeably smoother trigger take-up.
- Turnkey Compact Captured Guide Rod: Includes a standard-weight stainless steel guide rod featuring a pre-captured compact dual-recoil spring assembly to streamline your bench work.
- High-Tensile Steel Springs Pack: Features factory-calibrated spring rates across the striker, safety, and extractor systems to preserve reliable operational timing.
- Perfect Match-Grade Clearances: Fabricated to exact factory spec layout dimensions, completely eliminating stacked tolerance jams and slide binding.
Product Specifications
- Brand: Zaffiri Precision (Largo, Florida)
- Model Line: Factory Premium Slide Internal Component Overhaul Series
- MPN/SKU: UPK-G19G5 (Also cataloged as ZAF-UPK-G19G5-GEN5)
- UPC Code Profile: 810220065150
- Firearm Model Fitment: Glock® 19 Gen 5, Glock® 45, Glock® 19X Slides Only
- Striker Pin Base Material: Premium Ground Stainless Steel Core Billet
- Spring Composition Standard: High-Tensile Tempered Spring Steel Wire
- Recoil Guide Rod Style: Gen 5 Compact Dual-Spring Captured Rod with Standard Factory Weight
- Channel Liner Profile: Injection-Molded Low-Friction Polymer Cylinder Sleeve
- Compatible Cartridge Caliber: 9x19mm Parabellum (9mm Luger / 9mm NATO)
- Full Kit Component Checklist: Gen 5 Firing Pin, Striker Spring, Spacer Sleeves, Spring Cups, Gen 5 Safety Plunger, Plunger Spring, Extractor Depressor Rod, Spring Bearing, Extractor Spring, Gen 5 Slide Cover Plate, Channel Liner, Captured Dual-Recoil Compact Guide Rod Assembly
- Packaging Format Class: Zaffiri Precision Multi-Compartment Factory Packaging
- Product Type Category: Handgun Small Parts / Slide Internal Assembly Kits
- Overall Fitment Class: Compact Gen 5 Slide Internals
- Net Kit Assembly Weight: ~2.50 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
