Glock OEM Large Frame Upper Parts Kit | PF45 G20 G21

SKU: GLGUPK

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Glock OEM Large Frame Upper Parts Kit | PF45 G20 G21

Fits Polymer80 PF45 Large Frame Slide

The Glock OEM Large Frame Upper Parts Kit for PF45, G20 and G21 is the perfect solution for completing your slide assembly on a Polymer 80 PF45 frame. Designed for compatibility with Glock^® Gen 3 large frame models, including the G20 and G21, this kit contains 100% genuine Glock^® factory parts. Whether you’re finishing a new build or replacing worn components, this upper parts kit delivers factory-spec performance and reliability.

Each component in this Glock^® upper parts kit is brand new and precision-machined to exact tolerances. Trusted worldwide for their reliability, Glock^® OEM components are known for long-term durability and seamless compatibility. This upper parts kit includes everything you need to fully assemble your slide, excluding the barrel and sights. It’s ideal for those assembling a Polymer80 PF45 build for a G20 or G21 configuration.

Whether you’re building a full-sized 10mm or .45 ACP Glock^® style pistol, the Glock^® OEM PF45 Upper Parts Kit ensures your slide functions with smooth cycling, proper ejection, and reliable firing pin engagement. If you’re upgrading or troubleshooting, OEM parts like these restore original factory performance—no guesswork required.

Includes the following Glock^® Factory Parts:

Firing Pin
Firing Pin Spring
Firing Pin Spacer Sleeve
Spring Cups
Firing Pin Channel Liner
Safety Plunger & Spring
Complete Extractor with Loaded Chamber Indicator (LCI)
Extractor Depressor Plunger
Extractor Depressor Plunger Spring
Spring Loaded Bearing for LCI
Slide Cover Plate
Gen 3 Recoil Spring and Guide Rod Assembly

Note: This Glock^® OEM upper parts kit is designed for use with large frame Polymer80 PF45 slides and Glock^® Gen 3 G20/G21 compatible builds. It is not compatible with compact or standard frame models.

Have questions about your PF45 slide build or Glock^® upper parts? Our expert support team is here to help you complete your project.