Description
The Polymer80 PF45 is an 80% frame designed specifically for building your own Glock 20 (10mm) or Glock 21SF (.45 ACP) pistol. This is the foundation for a serious, large-frame build. It’s become one of our steady sellers since we started stocking it in late 2025. The PF45 gives you the control to create a custom large-frame pistol exactly how you want it.
Stand-Out Features
- Large-Frame Platform: Engineered specifically for the Glock 20 and 21SF slide assemblies and locking blocks.
- Aggressive Texturing: Molded-in stippling on the grip and front strap provides a secure, non-slip hold.
- Ergonomic Grip Angle: Features a 1911-style grip angle for a natural point of aim and comfortable shooting.
- Reinforced Polymer: Built with durable, high-strength polymer for reliable performance.
- Jig-Ready Design: Includes integral rails and is ready for use with the appropriate PF45 jig for completion.
Technical Data
| Model | PF45 |
| Compatibility | Glock 20 / 21SF (Large Frame) |
| Frame Type | 80% (Requires Machining) |
| Material | High-Strength Polymer |
| Weight (measured) | 2.9 oz |
| Grip Texture | Molded Aggressive Stippling |
| Grip Angle | 1911-Style |
| Finish | Matte Black |
Your Questions Answered
Does this frame work with Gen4 or Gen5 parts?
The PF45 is designed for Gen3-style large-frame parts kits. Our staff notes that when using Gen4 trigger housings or related components, the fit can be slightly tighter compared to Gen5-spec parts. This is not a functional issue, just something to be aware of during your build.
What tools do I need to complete this 80% frame?
You will need a Polymer80 PF45-specific jig (sold separately), a drill press or hand drill, and a router or Dremel tool with appropriate bits. Always follow the manufacturer’s instructions precisely for safe and proper completion.
Is this compatible with both Glock 20 and 21 slides?
Yes. The PF45 frame is designed to accept slides and locking blocks for both the Glock 20 (10mm) and the Glock 21SF (.45 ACP). You must use the correct caliber-specific slide, barrel, and locking block for your build.
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