Description
The Polymer80 PF45 80% Frame is the foundation for your custom Glock 20 or 21SF build. This frame is designed for the serious builder who wants a robust platform for the .45 ACP and 10mm platforms. It’s a blank canvas for your vision, requiring standard tools and jigs to complete. Since we started stocking this in Q4 2025, it’s consistently been one of our top-selling frames in the large-frame category.
Stand-Out Features
- Large-Frame Foundation: Engineered specifically for Glock 20 (10mm) and Glock 21SF (.45 ACP) slides and parts kits.
- Enhanced Ergonomic Grip: Features a more aggressive texture and a comfortable undercut trigger guard for improved control.
- 80% Design: Requires milling of the rear rail pocket and drilling of three pin holes to complete, offering a true builder’s project.
- Durable Polymer Construction: Made from high-strength polymer for a lightweight yet durable frame that balances heft and handling.
- Integrated Picatinny Rail: Includes a standard accessory rail for mounting lights or lasers to your finished build.
Technical Data
| Model | Polymer80 PF45 |
| Compatibility | Glock 20, Glock 21SF |
| Frame Type | 80% (Requires Completion) |
| Caliber | .45 ACP / 10mm |
| Material | High-Strength Polymer |
| Weight (measured) | 2.9 oz |
| Finish | Black, Textured |
| Accessory Rail | Integrated Picatinny |
Your Questions Answered
What generation Glock parts does this frame use?
The PF45 frame is designed to accept Gen 3 and Gen 4 Glock 20/21SF parts kits and slides. Our staff notes that with Gen 4 frames, the fit can be slightly tighter than with Gen 3 parts—this is normal and not a functional issue, just something you might notice during assembly.
What tools are needed to complete this 80% frame?
You will need a drill press or hand drill, a Dremel tool or milling machine, and the appropriate drill bits and end mills. A Polymer80 jig (sold separately) is required to properly guide the drilling and milling operations for a precise fit.
Is this frame compatible with aftermarket slides and barrels?
Yes. Once completed, the PF45 frame will accept any aftermarket or OEM Glock 20 or 21SF slide and barrel assembly that is compatible with Gen 3 or Gen 4 specifications. Always test fit components for safety and function.
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