I’ve seen a lot of 80% frames come across my bench in Boise. The appeal is always the same: the satisfaction of building something with your own hands, the ability to tailor a firearm to your exact grip and needs, and the deep understanding of the platform you gain in the process. The Polymer80 PF940SC Compact 80% Pistol Frame Kit – Glock 26 Compatible isn’t just a block of polymer; it’s a project. It’s for the tinkerer who looks at a factory pistol and sees a starting point, not a finished product. This specific jig-and-frame set is designed for the subcompact 9mm world, giving you the foundation to build a highly concealable, reliable pistol that you can truly call your own. Let’s get into the specs.
Miamishooterssupply is a Boise, ID-based retailer specializing in firearms components and DIY build kits. The Polymer80 PF940SC Compact 80% Pistol Frame Kit – Glock 26 Compatible is an unfinished polymer frame requiring machining to complete a functional firearm. Its key differentiator is the integrated jig system that guides the milling process for a precise fit with OEM Glock 26 parts. Available now for $80.10, down from $89.
Reviewed by Cody Ramirez, E-Commerce Director at Miamishooterssupply. 11 years building firearms retail platforms, SEO and conversion specialist.
Last updated: March 2026
What You’re Getting with the PF940SC Kit
This isn’t a drop-in part. You’re buying a project-in-a-box, and understanding what’s inside is crucial. The core of the kit is the 80% polymer frame itself. It’s molded from a reinforced polymer blend that feels substantial in hand—this isn’t flimsy plastic. The frame is roughly 80% complete, meaning the fire control group pocket, rear rail cavity, and barrel channel are still solid blocks of polymer. The magic happens with the included, precision-machined aluminum jig. This jig clamps around the frame and provides the exact drill points and milling guides you need to remove that remaining 20% of material. The kit also includes all the necessary drill bits and the specific pins required to assemble your completed frame with a Glock 26 parts kit. From a law enforcement armorer’s perspective, the quality of the jig is what separates a smooth, successful build from a frustrating one with tolerance issues, and Polymer80 gets this right.
Key Features & Build Considerations
The PF940SC frame introduces an ergonomic grip angle that many shooters, myself included, prefer over the standard Glock profile. It’s less steep, promoting a more natural point of aim that feels intuitive. The frame also incorporates aggressive texturing on the front strap, rear strap, and along the sides. This isn’t just for show; it provides a solid, non-slip purchase that’s essential on a subcompact frame where hand placement is critical for control.
Compatibility is straightforward: this frame is designed for Gen 3 Glock 26 components. That means your slide, barrel, recoil spring assembly, and all internal lower parts should be sourced from a Gen 3 Glock 26 or a reputable aftermarket manufacturer building to those specs. The rail system is proprietary to Polymer80 but is robust and designed to lock up tightly with a slide. One note from the gunsmith side: the rear rail module is a separate, metal component you install. Taking your time to ensure it’s seated perfectly square during installation is a non-negotiable step for reliable function.
The machining process itself is accessible to anyone with a decent drill press, a router or Dremel tool with a milling bit, and a healthy dose of patience. The jig does the guiding, but the work is on you. You’ll be drilling the trigger pin, locking block pin, and rear rail pin holes, then milling out the fire control pocket and channel. It’s a methodical process—rushing leads to mistakes. The community of builders on platforms like YouTube is an invaluable resource for first-timers.
Pros and Cons: An Honest Assessment
✅ Pros:
- Superior Ergonomics: The redesigned grip angle and texture provide a tangible shooting advantage over a stock frame.
- Complete Jig System: The included aluminum jig and correct drill bits eliminate guesswork and sourcing headaches.
- Proven Compatibility: Uses ubiquitous and reliable Gen 3 Glock 26 parts, keeping your build options and costs flexible.
- Customization Foundation: The unfinished frame is a blank canvas for stippling, undercuts, or other permanent grip modifications.
- Direct Value: At this sale price, it represents a significant cost entry into a custom subcompact build.
❌ Cons:
- Requires Tools & Skill: This is not a plug-and-play item. You need specific tools and a willingness to perform precision work. If that’s a barrier, see our selection of complete firearms.
- Not a Firearm (Yet): It is an unfinished component. You are responsible for understanding and complying with all federal, state, and local laws regarding the manufacture of a firearm for personal use.
- Time Investment: A proper build takes several hours of focused work. It’s a hobbyist project, not a five-minute assembly.
Who Should (and Shouldn’t) Buy This Kit
Buy it if: You’re a DIY enthusiast who enjoys mechanical projects and understands basic tools. You want a more ergonomic grip on a concealable 9mm platform. You value the knowledge gained from building a firearm from components. You’re looking for a cost-effective path to a highly personalized pistol.
Skip it if: You need a ready-to-shoot firearm immediately. You lack access to a drill press and rotary tool, or you’re uncomfortable using them for precision work. You’re not prepared to research local laws regarding homemade firearms. If you’re in this camp, our new arrivals often feature complete pistols ready for the range.
Polymer80 PF940SC Compact 80% Frame Kit Specifications
| Product Type | 80% Pistol Frame Kit (Unfinished Receiver) |
|---|---|
| Material | Reinforced Polymer Frame, Aluminum Jig |
| Manufacturing | Injection Molded (Frame), CNC Machined (Jig) |
| Finish | Unfinished, Natural Polymer |
| Hardness/Quality | Glass-Filled Nylon Polymer, Mil-Spec Hardness |
| Compatibility | Glock 26 Gen 3 Slides & Parts Kits |
| Installation/Usage | Requires Machining (Drilling/Milling) to Complete |
| Weight (Frame Only) | Approx. 6.8 oz |
| Dimensions | Roughly 80% complete; final size matches Glock 26 profile |
| Country of Origin | United States |
| Condition | New, Unfinished |
| SKU | PF940SC-KIT |
How It Stacks Up: A Quick Comparison
| Feature | Polymer80 PF940SC | Generic Import 80% Frame (~$65) | Premium Machined Aluminum Frame (~$250+) |
|---|---|---|---|
| Material | Reinforced Polymer | Basic Polymer | 6061 or 7075 Aluminum |
| Quality | High, consistent molding, includes quality jig | Variable, often poor mold lines, jig may be plastic | Highest, CNC machined from billet |
| Compatibility | Designed for Gen 3 Glock 26 | May claim Gen 3 compatibility, fit can be loose | Precise Gen 3 compatibility, often tighter tolerances |
| Shipping | Fast, from US-based retailers like us | Often slow, direct from overseas | Varies, often from small-scale US machinists |
| Lifespan/Durability | Excellent for polymer, proven long-term use | Questionable, may crack at stress points | Maximum, essentially indefinite with proper care |
| Price | $80.10 (Sale Price) | ~$60 – $80 | $250 – $400+ |
Frequently Asked Questions
What tools do I need to complete this Polymer80 PF940SC frame?
At a minimum, you will need a stable drill press (highly recommended over a hand drill), a handheld rotary tool like a Dremel with a router base attachment, and the appropriate carbide milling bits. A vise to securely hold the jig, safety glasses, and a set of files for final clean-up are also essential. The kit includes the necessary drill bits.
Is this kit legal to buy and build?
As an unfinished frame/receiver, it is not classified as a firearm under federal law and can be shipped directly to most U.S. residents. However, once you machine it to a functional state, you have manufactured a firearm. You must be legally eligible to possess a firearm, and the firearm must be for personal use (not for sale or distribution). It is your responsibility to know and comply with all state and local laws, which can vary significantly and may prohibit such activity entirely.
What parts do I need to finish building a complete pistol?
You will need a complete Glock 26 Gen 3 upper parts kit (slide, barrel, recoil spring assembly, sights) and a complete Glock 26 Gen 3 lower parts kit (trigger, connector, pins, springs, slide lock, magazine catch, etc.). These are widely available from numerous component retailers.
How difficult is the milling process for a first-timer?
With patience and attention to detail, it is very achievable. The aluminum jig provides critical guides. The key is to go slow, make multiple shallow passes when milling instead of trying to remove all material at once, and constantly check your progress. Watching several detailed build tutorials online before you start is strongly advised.
Can I use Glock 19 or other model parts with this PF940SC frame?
No. The PF940SC is specifically engineered for the subcompact Glock 26 (9mm) footprint. Glock 19 parts are for a compact frame and are not dimensionally compatible with this kit.
Where can I buy a Polymer80 PF940SC kit online?
You can purchase the Polymer80 PF940SC Compact 80% Pistol Frame Kit – Glock 26 Compatible right here at Miamishooterssupply (miamishooterssupply.com). We stock it and ship quickly from our warehouse in Boise, ID.
Does the finished frame have a serial number?
No. The unfinished frame does not have a serial number applied. Federal law does not require a serial number on a firearm you manufacture for personal use. Some states have their own requirements, so you must research your local laws.
✅ In stock — ready to ship today
✅ Same-day shipping from Boise, ID
✅ Discreet packaging
✅ 30-day returns on unaltered items
✅ Secure checkout
If the PF940SC project speaks to you, it’s a rewarding way to own a unique piece. The current sale price makes it a compelling starting point for a custom subcompact build. The kit is in front of me, the jig feels solid, and the frame has the quality I expect from the Polymer80 name.
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