Polymer80 PF940C Jig Kit for PF940C Frame Blanks - polymer 80
Pros & cons
What works
- Weighs 4.8 oz — 40% lighter than steel jigs
- ±0.002 inch hole alignment tolerance
- Includes three carbide drill bits ($12 value separately)
Trade-offs
- No frame blank included — adds $79-120 cost
- Requires drill press — not suitable for hand tools
- Drill bits wear after 5-7 frames — $15 replacement cost
Video review
Expert review
Specs at a glance
About this product
The Polymer80 PF940C Jig Kit is a 4.8-ounce aluminum fixture system designed to guide the milling and drilling operations required to complete a PF940C 80% polymer frame into a functional handgun lower receiver. This kit eliminates the need for specialized gunsmithing tools by providing precise drill bushing alignment for the three critical holes—trigger pin, slide lock, and rear rail—with ±0.002 inch positional tolerance. Production has been temporarily suspended builders seeking to complete PF940C frames.
What is the Polymer80 PF940C Jig Kit used for?
The PF940C Jig Kit is used to complete Polymer80's PF940C 80% frame blanks into functional Glock 19-compatible lower receivers. It provides guided drilling and milling locations for the three critical pin holes and rail sections, requiring approximately 90 minutes of shop time with a drill press and Dremel tool. The jig's aluminum construction ensures repeatable alignment across multiple frames, though it does not include the actual frame blank or finishing tools.
How does the Polymer80 PF940C Jig Kit compare to the 5D Tactical PRO Jig?
The Polymer80 PF940C Jig offers simpler operation at half the price of the 5D Tactical PRO Jig system but requires manual milling versus the 5D's router-based automation. The 5D Tactical PRO Jig completes frames in 15 minutes with router guidance but costs $189 and only works with specific router models. For builders on a budget who already own drill presses, the Polymer80 jig provides adequate precision at 50.99 dollars.
What does it weigh and what are the dimensions?
The jig kit weighs 4.8 ounces and measures 6.25 x 4.1 x 1.8 inches in its assembled state. This compact size fits standard drill press vises and requires only 12x12 inches of workbench space. The aluminum construction provides rigidity during milling operations while remaining portable enough for field use if necessary.
Who is this NOT for?
This jig is not suitable for builders lacking access to a drill press or rotary tool, as hand drilling will not maintain the required ±0.002 inch hole alignment. It also cannot be used with other frame models like the PF940V2 or Polymer80 LR-308 80% Lower Receiver, as jigs are model-specific. Beginners should consider completed frames instead due to the permanent nature of milling errors.
What's in the box?
The kit contains one aluminum jig fixture, three carbide drill bits (3mm, 4mm, and 6mm sizes), and six stainless steel locking pins for securing the frame blank. Notably absent are the frame blank itself and any milling bits, which must be purchased separately. The drill bits feature 135-degree split points for clean entry but will require replacement after approximately 5-7 frames due to polymer abrasion.
Is the Polymer80 PF940C Jig Kit worth it at $50.99?
At $50.99, this jig provides adequate value for builders completing multiple PF940C frames but becomes cost-prohibitive for single-use applications. Compared to the .308 80% Lower – Billet jig system at $74.99, the PF940C kit offers similar precision for smaller frames. Given production discontinuation, current pricing reflects scarcity rather than manufacturing cost, making timely acquisition advisable for intended users.
Key attributes
| Weight | 4.8 oz |
| Dimensions | 6.25 x 4.1 x 1.8 in |
| Material | 6061 aluminum |
| Compatibility | PF940C frames only |
| Includes | 3 drill bits, 6 pins |
Frequently asked questions
- Is it compatible with Gen 4 Glock slides?
- Yes, the completed PF940C frame matches Gen 3 Glock 19 specifications, which are compatible with Gen 4 slides using adapter plates. The jig itself only guides frame machining and has no slide interaction.
- Does this work with aftermarket locking blocks?
- The jig positions holes for OEM-spec locking blocks only. Aftermarket components may require modification, as detailed in our [Effect of Lubricants on PolyLock Frame Wear](/blog/effect-of-lubricants-on-polylock-frame-wear/) article.
- How long does shipping take?
- Orders process within 3 business days via USPS Priority Mail, with delivery typically occurring 2-5 days thereafter. Cryptocurrency payments may add 24 hours for confirmation.
- Can I return it if I damage the frame?
- No returns are accepted for user-damaged frames or incorrectly machined components. The jig itself carries a 30-day warranty against manufacturing defects only.