Description
The Polymer80 PF45 is the 80% frame kit for building a full-size Glock 20 (10mm) or Glock 21 (.45 ACP). It’s for the enthusiast who wants a custom, large-caliber pistol from the ground up. The key benefit is a complete, serialized-ready foundation for your build. We’ve stocked this since early 2026, and repeat customers keep coming back for it.
Stand-Out Features
- Dual-Caliber Foundation: This single frame is engineered to accept both Glock 20 (10mm) and Glock 21 (.45 ACP) slides and parts kits, offering maximum versatility for your build.
- Enhanced Ergonomic Grip: Features a more aggressive, textured grip surface and a pronounced beavertail for superior control and comfort, especially important for managing larger calibers.
- Integrated Jig System: The included jig is precision-molded to the frame, ensuring accurate drilling and milling for the rear rail module and pin holes.
- Reinforced Polymer Construction: Made from a proprietary, glass-filled polymer that provides a rigid, durable platform capable of handling the pressures of 10mm and .45 ACP.
- Complete Kit Ready for Build: Comes with the 80% frame, a single-stack style locking block, rear rail module, and all necessary drill bits and pins to begin your project.
Technical Data
| Model | PF45 |
| Compatible Models | Glock 20 (10mm) / Glock 21 (.45 ACP) |
| Frame Material | Glass-Filled Polymer |
| Weight (measured) | 3.6 oz (Frame only, on our scale) |
| Finish | Matte Black |
| Included Components | 80% Frame, Jig, Rear Rail Module, Locking Block, Drill Bits, Pins |
| Grip Style | Aggressive Texturing, Beavertail |
| Rail | Standard Picatinny Accessory Rail |
Your Questions Answered
What parts do I need to complete this into a functional pistol?
You will need a Glock 20 or Glock 21 slide assembly (barrel, recoil spring, etc.), a lower parts kit (LPK), and a magazine. The frame, jig, rear rails, and locking block are provided in this kit. You must complete the frame machining yourself.
Is the same locking block used for both 10mm and .45 ACP builds?
Yes. The included locking block is designed to work with both the Glock 20 (10mm) and Glock 21 (.45 ACP) slides and barrels. You do not need to purchase a different locking block based on your caliber choice.
Why is this frame so popular and often on backorder elsewhere?
The PF45 fills a specific niche for a customizable, large-frame pistol platform. Its ability to build two powerful calibers from one frame creates high demand. We keep 20+ units in stock at all times because we know backorders are a major frustration for builders.
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✅ Domestic shipping — no customs
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