Polymer80 PF45 80% Pistol Frame Only

The Polymer80 PF45 80% pistol frame only represents a critical component for builders seeking a large-frame, .45 ACP or 10mm Auto platform. This unfinished frame requires completion by the end user, allowing for a customized build that meets specific ergonomic and functional preferences. Constructed from high-impact, glass-reinforced polymer, the PF45 is designed to accept Glock 21 and Glock 20 Gen3 slide assemblies and parts kits, offering a robust foundation for a full-size pistol project. As an 80% frame, it is not a firearm and may be shipped directly to your door without an FFL transfer, pending final state and local regulations. This listing is for the frame only; no jig, slide, barrel, or lower parts kit is included.

Overview

The Polymer80 PF45 80% pistol frame only is a precision-machined, unfinished polymer frame intended for the experienced builder. It is engineered to replicate the dimensions and mounting points of a standard Glock 21 or Glock 20 Gen3 frame, but with enhanced ergonomics including an integrated beavertail, a textured grip pattern, and an undercut trigger guard. The frame arrives with the front and rear rails embedded into the polymer, requiring the user to complete the milling of the front locking block pocket and drill the necessary pin holes. This frame is compatible with standard Glock 21/20 Gen3 lower parts kits, slides, and magazines.

Features & Specs

• Manufacturer: Polymer80. Category: Frames. The PF45 is a dedicated large-frame platform, distinct from the PF940C (compact) and PF940V2 (full-size 9mm/40 S&W) lines. It is specifically engineered for the larger breach face and slide dimensions required by .45 ACP and 10mm Auto cartridges.
• Material & Construction: Glass-reinforced Nylon-6 polymer with a melonite-textured surface. The frame features integral steel front and rear rail systems, pre-installed at the factory. The frame is 80% complete, meaning the front rail pocket (locking block) is left partially formed, and the trigger housing pin hole, trigger pin hole, and slide lock spring hole are undrilled.
• Ergonomics & Compatibility: Integrated beavertail, aggressive front and backstrap texturing, an undercut trigger guard, and a flared magazine well. The frame is designed for standard Glock 21 Gen3 or Glock 20 Gen3 slide assemblies, barrels, recoil springs, and lower parts kits. It accepts standard Glock 21 (13-round) and Glock 20 (15-round) magazines.
• Dimensions: Overall length of the frame is approximately 8.5 inches, with a grip length of 5.5 inches. The trigger guard width is 1.1 inches. The frame weight is approximately 4.2 ounces before completion.

Who It’s For

The Polymer80 PF45 80% pistol frame only is intended for the intermediate to advanced firearms builder who possesses the necessary tools and technical knowledge to complete the frame. This includes access to a drill press or handheld drill, a vise, pin punches, and appropriate safety equipment. It is ideal for individuals who wish to assemble a custom .45 ACP or 10mm handgun that is not registered as a firearm at the time of frame purchase. This frame is not suitable for beginners unfamiliar with polymer frame modification, as improper drilling or milling can render the frame unusable. It is also appropriate for those who prefer the ergonomics of the larger PF45 grip versus standard Glock factory frames.

Shipping & FFL

This Polymer80 PF45 80% pistol frame only is classified by the ATF as a non-firearm item. As a result, it may be shipped directly to your residential or business address without requiring a transfer through a Federal Firearms License (FFL) holder. However, it is the sole responsibility of the purchaser to verify that the purchase, possession, and completion of an 80% frame is legal in their specific city, county, and state. Some states and localities have enacted laws restricting or prohibiting the possession of unfinished frames. By purchasing this item, you acknowledge that you are in compliance with all applicable laws. No liability is assumed for the use or misuse of this product. All sales are final.