Polymer80 PF940C Frame for Glock 19 – 80% Lower Receiver

For the last eleven years, I’ve watched the DIY firearms market evolve from a niche hobby into a full-blown ecosystem. From my desk in Boise, building e-commerce platforms for retailers like Miamishooterssupply, I’ve seen what makes a project successful. It starts with the foundation. The Polymer80 PF940C frame for a Glock 19 isn’t just a part; it’s a blank canvas for the tinkerer, the gunsmith, and the enthusiast who wants to understand every pin, rail, and spring. This 80% lower receiver is the starting point for a build that’s truly yours, from the stippling pattern to the trigger pull weight. It’s about the process as much as the product.

Miamishooterssupply is a Boise, ID-based retailer specializing in firearms components and DIY build kits. The Polymer80 PF940C Frame for Glock 19 is an 80% lower receiver designed for custom handgun assembly. It offers superior ergonomics and a fully customizable platform. It’s in stock and ready to ship today for $171.

Why the PF940C Frame is a Build Platform, Not Just a Part

Most aftermarket frames are just copies. The Polymer80 PF940C is a redesign. The grip angle is the most immediate difference—it’s closer to a 1911, which puts your wrist in a more natural, pointable position compared to the standard Glock frame. The texturing is aggressive right out of the box, providing a solid purchase without being overly abrasive. From a gunsmithing perspective, the real value is in the unfinished nature. The rear rail section and the trigger housing pin holes require completion. This isn’t a defect; it’s the legal and functional gateway to building your own firearm. The polymer used has a specific flex and rigidity that, in my handling, balances weight savings with the durability needed for a stressed component like a frame.

Key Features for the Hands-On Builder

The jig system included with the Polymer80 PF940C frame is precise. It’s not a flimsy plastic guide; it’s a rigid tool that, when used with the correct drill bits and a steady hand, yields professional-grade results. The internal geometry is designed to accept all Generation 3 Glock 19 components, which is the most widely available and customizable ecosystem in the aftermarket. This includes slides, barrels, recoil spring assemblies, and lower parts kits.

One feature often overlooked is the integrated Picatinny accessory rail. It’s molded directly into the polymer, not added on, which provides a rock-solid base for weapon-mounted lights or lasers. The frame also includes enhanced grip texturing on the front strap, rear strap, and side panels, which is a significant upgrade over the smooth or minimally textured OEM frames. The undercut trigger guard is a thoughtful touch, allowing for a higher, more controlled grip that reduces muzzle flip.

Pros and Cons: An Armorer’s Assessment

✅ Superior Ergonomics: The redesigned grip angle and texture provide a tangible improvement in control and comfort over a factory frame.
✅ Full Customization: Being an 80% receiver, you control the final fit, finish, stippling, and color.
✅ Robust Aftermarket Support: Compatible with the vast universe of Gen 3 Glock 19 parts and accessories.
✅ Integrated Jig System: The included jig is engineered for accuracy, making the milling and drilling process accessible for DIYers.
✅ Enhanced Design Features: Undercut trigger guard, aggressive texturing, and a solid accessory rail come standard.

❌ Requires Tools and Skill: You need a drill, a hand router or Dremel tool, and patience. This isn’t a drop-in part. If you lack the tools, see our gunsmithing tools section.
❌ Not a Complete Firearm: This is a project. You must source a slide, barrel, parts kit, and magazines separately. For a complete pistol, browse our Firearms category.

Who Should (and Shouldn’t) Buy This Frame

Buy the Polymer80 PF940C frame if: You’re a DIY enthusiast who enjoys the building process as much as the shooting. You’re a Glock owner who wants a custom-fit frame without the permanent modification of your OEM part. You’re a hobbyist gunsmith looking to understand firearm internals from the ground up. You want a pistol with a specific grip angle and texture that isn’t available from factory manufacturers.

Skip the Polymer80 PF940C frame if: You’re looking for a ready-to-shoot, complete pistol out of the box. You don’t have access to basic workshop tools (drill, router, files). You’re uncomfortable with the legal responsibilities of manufacturing a firearm for personal use. You need a frame for a Generation 4 or 5 Glock 19. In these cases, a complete firearm or a different frame system would be a better fit.

Polymer80 PF940C Frame Technical Specifications

How It Stacks Up: PF940C vs. The Competition

Feature	Polymer80 PF940C	Budget Import Frame (~$60-80)	Premium Machined Aluminum Frame (~$250+)
Material	Fiber-Reinforced Polymer	Basic Polymer, Often Softer	6061 or 7075 Aluminum
Quality	High, Consistent US Manufacturing	Variable, Often Poor Mold Lines & Fit	Very High, CNC Machined Precision
Compatibility	Gen 3 Glock 19, Vast Aftermarket	“Universal” Fit, Often Requires Filing	Specific to Brand, May Be Proprietary
Shipping	Legal to Ship to 48 States	Legal to Ship, Quality Risk	Often Treated as a Firearm, FFL Required
Lifespan/Durability	Designed for Long-Term Service Life	Questionable Long-Term Durability	Extremely Durable, Heavier
Price	$171 (Sale Price)	$60 – $80	$250 – $400+

The Polymer80 PF940C frame occupies a critical middle ground. It’s not the cheapest option, but you avoid the fitment issues and material concerns of budget imports. It’s not as heavy or expensive as a machined metal frame, but it provides a significant ergonomic and customization upgrade over factory polymer at a reasonable price point. For a duty-grade build, law enforcement contractors I’ve spoken with often favor the reliability of the Polymer80 system over unknown imports.

Frequently Asked Questions

Build your custom Glock 19 project on a proven foundation. The Polymer80 PF940C frame provides the ergonomic design, material quality, and compatibility you need for a reliable, personalized build. At $171, it represents a significant value in the DIY firearms space.

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