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

Overview

If you are looking to build a full-size pistol that chambers the heavy-hitting 10mm Auto or .45 ACP, the Polymer80 PF45 80% Full Size Frame and Jig Kit (Glock 20/21 Compatible) is your starting point. This kit brings the same modular, do-it-yourself philosophy that made the PF940 series a favorite, now scaled up for large-frame Glock-compatible builds. The PF45 frame is built from a tough, engineering-grade polymer and comes paired with a precision-machined jig that guides your drill and router bits through the completion process. Whether you are a seasoned builder or just beginning your first 80% project, this kit gives you the foundation to create a reliable, custom pistol that fits your hand and your caliber preference.

Features & Specs

The Polymer80 PF45 80% Full Size Frame and Jig Kit (Glock 20/21 Compatible) is engineered for durability and accuracy. The frame geometry matches the full-size Glock 20 and 21 pattern, giving you a longer sight radius and a comfortable grip for larger cartridges. The integrated jig system uses hardened steel bushings to keep your drill bits on track, reducing the chance of misalignment. Below are the key specifications and highlights you can expect from this kit.

• Manufacturer: Polymer80 | Category: Frames | Compatible with Glock 20 (10mm) and Glock 21 (.45 ACP) slide assemblies, barrels, and lower parts kits.
• Complete jig system included: hardened steel drill bushings, alignment pins, and a reusable polymer jig that indexes off the frame’s rail sections.
• Frame material: reinforced polymer with textured grip panels, an integrated trigger guard undercut, and a flared magwell for faster reloads.

Who It’s For

This kit is built for the hands-on shooter who wants a full-size pistol that punches hard. If you carry a Glock 20 for backcountry protection or run a Glock 21 in competition, the Polymer80 PF45 80% Full Size Frame and Jig Kit (Glock 20/21 Compatible) offers a way to build a pistol that matches your exact preferences for trigger, sights, and grip texture. It is also ideal for hobbyists who enjoy the process of completing an 80% frame—drilling the three pin holes, cutting the slide channel, and fitting the locking block. No prior gunsmithing experience is required, but you will need basic tools like a drill press or hand drill, a few drill bits, and a steady hand. This kit gives you a legal way to build a firearm for personal use without a serial number, as long as you comply with federal and state laws.

• Best suited for builders comfortable with drilling and light hand filing; no welding or machining required.
• Compatible with standard Glock 20/21 magazines, slides, barrels, and lower parts kits from brands like OEM, Lone Wolf, and Sintercore.
• Includes detailed instructions and a downloadable video guide from Polymer80 to walk you through each step.

Shipping & FFL

Because the Polymer80 PF45 80% Full Size Frame and Jig Kit (Glock 20/21 Compatible) is classified as an unfinished, non-firearm frame blank, it ships directly to your doorstep without needing a transfer through a Federal Firearms License (FFL) dealer. No background check is required at the time of purchase. However, once you complete the frame by drilling the necessary holes and removing the channel block, it becomes a finished firearm under federal law. You are responsible for ensuring that building an 80% frame is legal in your state and local jurisdiction. Some states, such as California, New York, New Jersey, and Washington, have restrictions on the purchase or possession of unfinished frames. Please check your local laws before ordering. We do not ship to PO boxes or APO/FPO addresses for this item. Standard shipping rates apply, and tracking information will be emailed once your order is processed.

• No FFL transfer required for purchase; ships to your home or business address.
• Buyer must be 21 years of age or older and comply with all federal, state, and local laws regarding firearm frame possession.
• If you have any questions about legal compliance in your area, contact our customer service team before placing your order.