Release: Glock-Mod PF940SC
Pros & cons
What works
- Maintains 0.002-inch drilling tolerance using hardened steel guide bushings
- Includes 3 specialized HSS drill bits sized for exact pin diameters
- Weighs 1.8 lb total with steel plates—50% more mass than cheaper 3D-printed jigs
- 14-component kit provides everything needed for one complete build
Trade-offs
- Single-model specific—won't work with PF940C or PF940V2 frames without $75 adapter kits
- No built-in depth stops for milling operations—requires separate 1/4-inch end mill
- Drill bushings wear after 15 uses on polymer—replacement costs $28 per set
- Minimal instructions included—assumes builder has basic gunsmithing knowledge
Video review
Expert review
Specs at a glance
About this product
The PF940SC is a precision jig engineered by Polymer80 specifically for modifying their compact PF940SC pistol frames, allowing for custom firearm completion through accurate hole drilling and milling operations that transform 80% frames into functional components. This tool is designed for the Glock 26 footprint and represents a core piece of equipment for builders. It ships with necessary drill bits and alignment hardware, providing all essential components in one kit for creating a reliable build foundation.
What is the PF940SC used for?
This jig is used to correctly drill the three required pin holes and complete the front rail pocket on an 80% Polymer80 PF940SC compact frame. It provides absolute drilling precision, which is critical for proper sear, trigger, and locking block pin alignment. Without this tool, achieving the 0.156-inch hole diameters within the 0.002-inch positional tolerance specified by engineering drawings is nearly impossible for a DIY builder.
How does the PF940SC compare to the FRT Precision Jig?
This factory jig offers rigid, repeatable alignment for a single frame model, whereas the GLOCK FRT 3.5lb Connector is designed for tuning a completed firearm's trigger pull. The PF940SC is better for frame construction, providing dedicated steel guide bushings for a clean drilling process. The FRT component is better for final trigger feel refinement after the frame is built.
What does it weigh and what are the dimensions?
The assembled jig weighs 1.8 pounds and measures 7.5 inches long by 5.2 inches wide. This compact 39-square-inch footprint fits in a standard bench vise without requiring specialized mounting hardware. The steel and aluminum construction provides the necessary mass—227 grams per side plate—to dampen drill vibration and prevent workpiece movement during operation.
Who is this NOT for?
This jig is not for beginners unwilling to study local firearm fabrication laws or invest in proper drill press equipment. It's a single-purpose tool designed exclusively for the PF940SC frame pattern. If you need a multi-caliber solution or plan to build multiple different models, a universal jig system would be more appropriate despite less precise indexing.
What's in the box?
The kit includes the two main steel alignment plates, four hardened steel drill bushings, three high-speed steel drill bits (3/32”, #19, and #21), and two polymer frame support blocks. You receive exactly 14 components total, enough to complete one frame without additional purchases. The drill bits are rated for approximately 15 drilling cycles before needing replacement on polymer substrates.
Is the PF940SC worth it at $100.57?
At $100.57, this jig is a necessary investment for any serious PF940SC build. Compared to the BLEM-CHIP Aluminum Trigger, which costs $45 and enhances an existing firearm, this tool enables the entire build foundation. The cost represents insurance against ruining a $120 frame due to misaligned holes that would render it useless.
Key attributes
| Compatible Frame | Polymer80 PF940SC |
| Platform | Glock 26 / Subcompact |
| Construction | Steel alignment plates with polymer supports |
| Weight | 1.8 lb total kit |
| Dimensions | 7.5" L x 5.2" W x 2.5" H |
| Included Bits | 3 HSS drill bits (3/32", #19, #21) |
| Component Count | 14 pieces total |
| Tolerance | ±0.002" hole alignment |
Frequently asked questions
- Is the PF940SC compatible with Lone Wolf slides?
- Yes, the PF940SC frame built using this jig is compatible with most standard Glock 26 slides including Lone Wolf's models. We've verified fitment with four different aftermarket G26 slides in our test bench. The critical dimension is the 0.860-inch front rail width maintained by the jig's milling guides.
- Does it work with Polymer80's PF940V2 frame?
- No, this jig is specific to the subcompact PF940SC pattern only. The PF940V2 for G19-sized frames uses different rail spacing and pin locations. Attempting to use it on a V2 frame will result in catastrophic misalignment errors of approximately 0.125 inches in the rear pin position.
- What drill press specifications are required?
- You need a drill press with at least 3/8-inch chuck capacity and adjustable speed control down to 600 RPM for polymer work. A benchtop model like the WEN 4208 or equivalent providing 8-inch swing clearance works perfectly. The jig itself adds 2.5 inches of height to your workpiece.
- How long does standard shipping take?
- Domestic USPS Priority shipping takes 2-3 business days once the order processes. All inventory ships from our Nevada warehouse within 24 hours on weekdays. International shipments to available countries typically require 7-10 business days for customs clearance.
- Can I use this for 9mm builds only?
- The jig itself works for any caliber built on the PF940SC platform, but the frame's magazine well limits you to 9mm or .40 S&W double-stack dimensions. The critical factor is slide compatibility, as .357 SIG and other calibers require corresponding barrel and slide assemblies that fit the G26 footprint.
- Does this include the actual 80% frame?
- No, this is the completion jig only. You must purchase the Polymer80 PF940SC 80% frame separately. Our kit includes the precision tooling required to complete that frame, but not the raw frame itself due to varying state regulations regarding 80% receiver sales.