1. Introduction to the PF940SC
The PF940SC is a compact 80% pistol frame designed for firearm enthusiasts who value customization, discretion, and personal involvement in the build process. Produced by Polymer80, this frame is tailored for those who want a subcompact Glock®-style pistol but prefer to assemble it themselves.
Its appeal lies in the combination of versatility and control: you choose the components, fine-tune the ergonomics, and end up with a sidearm that reflects your personal preferences. Unlike fully manufactured firearms, the PF940SC arrives as an unfinished frame—meaning it requires some machining and assembly before it can function. This places it in a unique legal category in many jurisdictions, making it important for builders to understand the laws before beginning their project.
2. Design and Features of the PF940SC
The PF940SC is specifically modeled for a subcompact format, making it ideal for concealed carry and discreet storage. While its footprint is small, it retains the robust feel and reliability associated with larger platforms.
2.1 Compact Frame Specifications
Measuring similarly to the Glock 26 platform, the PF940SC offers a reduced grip length and barrel size without sacrificing handling. This makes it suitable for everyday carry while remaining comfortable during extended range sessions.
2.2 Material and Durability
The frame is injection-molded from high-strength polymer, providing a balance of rigidity and flexibility. This material is resistant to corrosion, impact damage, and environmental wear—qualities especially important for those who carry in varied climates.
2.3 Compatibility with Glock Components
One of the PF940SC’s most attractive features is its broad compatibility with OEM and aftermarket Glock parts. Most slide assemblies, barrels, and internal components designed for the Glock 26 fit seamlessly, allowing for significant customization.
3. Building the PF940SC
For many, the most rewarding part of owning a PF940SC is the build itself. While the project is straightforward, it requires precision, the right tools, and patience.
3.1 Tools Required
The typical build requires a drill press or hand drill, a Dremel or file for fine adjustments, a vise to hold the frame in place, and a finishing jig (usually included with the kit). Safety gear—such as protective glasses and gloves—is also essential.
3.2 Step-by-Step Build Process
The process begins with securing the frame in the provided jig, then carefully removing excess polymer from specific areas. Once the milling and drilling are complete, the builder can install the locking block, trigger assembly, and other internals. The final step involves pairing the frame with a compatible slide and barrel.
3.3 Common Mistakes to Avoid
Rushing the milling process can result in misalignment, leading to malfunctions or safety hazards. Over-removing material or failing to follow the jig’s guidance can also compromise the frame’s structural integrity. It’s important to measure twice, cut once, and keep tools steady.
4. Performance and Testing
Once built, the PF940SC is capable of delivering performance on par with factory pistols, provided the assembly was done correctly.
4.1 Ergonomics and Handling
The PF940SC features an aggressive grip texture and finger grooves that help maintain control during rapid fire. Its subcompact profile makes it highly maneuverable, though it may require an extended magazine for those with larger hands.
4.2 Accuracy and Reliability
When properly assembled with quality components, the PF940SC can achieve tight groupings at self-defense distances. Reliability largely depends on the quality of parts used and whether the build adhered to precise tolerances.
4.3 Maintenance and Care
Routine cleaning—especially after heavy use—is essential. Builders should inspect wear points on the slide rails, locking block, and trigger components. Lubrication according to Glock maintenance guidelines will help maintain performance over time.
5. Legal and Safety Considerations
The PF940SC falls under the category of an 80% frame, which is not considered a firearm under federal law in the United States until it is completed. However, state and local regulations vary widely—some jurisdictions require serialization or prohibit home-built firearms entirely.
Before starting any build, it’s critical to research applicable laws. Beyond legality, safety is paramount: always follow firearm handling rules, conduct thorough function checks after assembly, and ensure the pistol is only used in safe, controlled environments.
The PF940SC offers a unique blend of personalization, compact design, and hands-on craftsmanship. For those willing to put in the time and attention to detail, it can become a reliable concealed carry option or a rewarding hobby project—provided the builder approaches it with knowledge, patience, and responsibility.
