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

If you are looking to build a full-size .45 ACP or 10mm handgun from the ground up, the Polymer80 PF45 80% Full Size Frame and Jig Kit (Glock 20/21 compatible) is the foundation you have been waiting for. This kit gives you the control to finish a frame at your own pace, using basic hand tools and a little patience. We have seen a steady demand for this specific platform because it bridges the gap between a custom build and factory reliability. Whether you are a seasoned builder or stepping into your first 80% project, this frame kit delivers a solid, full-size grip and a straightforward completion process that respects your time and skill level.

Overview

The Polymer80 PF45 is designed to accept Glock 20 and Glock 21 upper parts, magazines, and holsters, making it a versatile option for anyone who already owns or plans to own one of those calibers. The kit includes the unfinished frame and the necessary jig to guide your drilling and routing. Unlike some other 80% kits on the market, the PF45 jig is robust and indexed clearly, reducing the chance of misalignment. This is a complete starting point for a full-size pistol build that feels substantial in the hand without being cumbersome. You get the ergonomics of a modern polymer frame with the satisfaction of finishing it yourself.

Features & Specs

Let us break down what makes this Polymer80 PF45 80% Full Size Frame and Jig Kit (Glock 20/21 compatible) stand out in a crowded field. The frame itself is made from a high-impact, glass-reinforced polymer that holds up well under recoil and harsh conditions. The integrated jig is precision-machined to keep your drill bit and end mill on track, so you do not have to guess where material needs to go. Here are the key specs you need to know:

• Manufacturer: Polymer80
• Category: Frames (80% unfinished)
• Compatibility: Glock 20 (10mm) and Glock 21 (.45 ACP) upper assemblies, magazines, and holsters
• Frame material: Glass-reinforced polymer with a textured grip surface
• Includes: One unfinished PF45 frame, one modular jig block, drill bits, end mill, and instruction booklet

We also want to highlight the ergonomic improvements over a standard factory frame. The grip angle is slightly more natural for most shooters, and the trigger guard is undercut to allow a higher grip. The rail system is a standard 1913 Picatinny section up front, so you can mount a light or laser without adapters. The jig itself is reusable if you decide to build multiple frames, though you will need to order additional frame kits separately.

Who It Is For

This kit is ideal for the hands-on shooter who values the process of building as much as the final product. If you already own a Glock 20 or 21 and want a second frame for a dedicated competition, truck gun, or range toy, the Polymer80 PF45 80% Full Size Frame and Jig Kit (Glock 20/21 compatible) gives you that option without buying a whole new pistol. It is also a great choice for someone who wants to learn how 80% frames work without jumping into a complex platform. The instructions are clear, and the jig does most of the alignment work for you. That said, this is not a drop-in project. You will need a drill press or a steady hand with a hand drill, plus a few hours of focused work. If you enjoy tinkering and want a full-size frame that feels custom to your grip, this is the kit to pick up.

Shipping & FFL

Because this item is classified as an 80% frame, it is not considered a firearm under federal law and does not require shipment to a Federal Firearms License (FFL) dealer. We can ship the Polymer80 PF45 80% Full Size Frame and Jig Kit (Glock 20/21 compatible) directly to your doorstep in most states. However, you must check your local and state laws before ordering. Some states and municipalities have specific restrictions on 80% frames, and it is your responsibility to ensure compliance. We will not ship to locations where these frames are prohibited. Once you complete the frame by drilling the pin holes and removing the material in the trigger pocket, it becomes a firearm, and you should be aware of any serialization or registration requirements in your area. If you have questions about your state’s laws, please contact us before placing your order.