Polymer80 PF45 80% Full Size Frame and Jig Kit (Glock 20/21 Compatible)

For builders seeking a robust platform for large-caliber builds, the polymer80 pf45 80% full size frame and jig kit (glock 20/21 compatible) offers a precision-engineered foundation. This kit delivers the structural integrity and dimensional accuracy required for completing a full-size 80% frame at home. Designed for shooters who demand reliability in a .45 ACP or 10mm Auto platform, this frame kit is machined from high-strength polymer and includes all necessary tooling to finish the receiver to specification.

Overview

The polymer80 pf45 80% full size frame and jig kit (glock 20/21 compatible) is a complete solution for constructing a serialized firearm from an unfinished frame. Manufactured by Polymer80, this kit is engineered to accept Glock 20 (10mm) and Glock 21 (.45 ACP) upper assemblies, magazines, and lower parts. The frame comes pre-machined with guide rod channels and trigger housing pockets, requiring only material removal in the fire control cavity and rear rail channels to reach completion. This kit is not a finished firearm; it is a precisely machined component requiring final finishing and assembly.

Features and Specs

This kit provides all essential components for frame finishing, with emphasis on material quality and dimensional tolerances. The frame is constructed from reinforced polymer to withstand the recoil forces of full-power 10mm and .45 ACP ammunition. The included jig system ensures repeatable alignment for drilling and milling operations.

• Frame material: Reinforced polymer with steel rear rail insert; compatible with Glock 20 and Glock 21 upper parts kits, trigger groups, and magazines
• Kit contents: PF45 80% frame, modular jig block, three drill bits (1.5mm, 2.5mm, 3mm), end mill bit, rear rail jig, and locating pins
• Required completion steps: Drill three holes in fire control cavity using provided jig; cut rear rail channels to depth using end mill; polish and lubricate before assembly

The polymer80 pf45 80% full size frame and jig kit (glock 20/21 compatible) features a textured grip surface with interchangeable backstraps to accommodate varying hand sizes. The frame includes an integrated trigger guard undercut and a beavertail design for improved recoil management. Overall frame dimensions match factory Glock 20/21 full-size specifications, ensuring compatibility with holsters and aftermarket accessories.

• Grip angle: 22-degree standard Glock pattern; interchangeable backstraps included (small, medium, large) for grip circumference adjustment
• Frame weight: 3.2 ounces (unfinished); overall length: 8.15 inches; rail system: single Picatinny accessory rail forward of trigger guard
• Compatibility: Glock 20/21 slides, barrels, recoil springs, and lower parts kits; aftermarket triggers and connectors may require minor fitting

Who It Is For

This kit is intended for experienced firearm builders who understand the legal and mechanical requirements of completing an 80% frame. It is suited for shooters who prefer the full-size grip length and recoil characteristics of the Glock 20/21 platform, particularly those loading for 10mm hunting or .45 ACP defensive use. The frame is not recommended for first-time builders without prior experience drilling and milling polymer components. This kit requires access to a drill press or hand drill, a vise, and basic gunsmithing tools. The builder must verify local and federal laws regarding frame completion and serialization before proceeding.

• Recommended for: Intermediate to advanced builders familiar with Glock platform assembly; shooters needing a durable frame for heavy-recoil calibers
• Not recommended for: Builders without mechanical experience or those seeking a drop-in ready frame; individuals who cannot legally possess a firearm

Shipping and FFL

This product is classified as an unfinished frame (80% receiver) and is not a firearm under current federal regulations. It may be shipped directly to your residence without an FFL transfer. However, the completed frame must be serialized and transferred through a Federal Firearms Licensee (FFL) if sold, traded, or transferred to another person. Check your state and local laws before ordering, as some jurisdictions impose restrictions on 80% frames. By purchasing this product, you confirm that you are legally eligible to possess a firearm and that you will comply with all applicable laws regarding the completion and transfer of this frame. Polymer80, Inc. and the retailer assume no liability for misuse or noncompliance with local regulations.