Polymer80 PF940C Jig Kit for PF940C Frame Blanks - polymer 80
Pros & cons
What works
- Weighs 1.3 lb — lightweight for field transport
- Drilling time under 30 seconds per hole
- Includes PDF layout with CNC coordinates
Trade-offs
- Requires a bench mill or drill press — not handheld
- No pre‑installed stippling — adds $40‑$80 finishing step
Video review
Expert review
Specs at a glance
About this product
What is the Polymer80 PF940C Jig Kit for PF940C Frame Blanks? It is a precision‑engineered jig set that enables you to mill a PF940C lower receiver from polymer blanks with minimal error. Designed for 80% frames, the kit eliminates guesswork and reduces machining time to under 30 minutes for experienced users.
What is the Polymer80 PF940C Jig Kit used for?
The kit is used to accurately drill and mill PF940C frame blanks into functional lower receivers. It aligns the drill bits within ±0.02 mm tolerance, ensuring consistent fit for the trigger group and fire control components.
How does the Polymer80 PF940C Jig Kit compare to the Polymer80 80% Lower Receiver and Jig Kit (LR-308)?
The PF940C jig is 15% faster to set up than the LR-308 kit, completing the primary drilling steps in roughly 22 seconds versus 26 seconds on average. While both kits use the same material grade, the PF940C’s custom alignment plates reduce cumulative error, making it the better choice for PF940C builds.
What does it weigh and what are the dimensions?
The jig set weighs 1.3 lb (590 g) and measures 9.5 × 6.2 × 2.1 in (241 × 158 × 53 mm) when packed. Its compact footprint fits in a standard shooter’s toolbox without adding bulk.
Who is this NOT for?
This kit is not for first‑time builders who have never used a bench mill or drill press. Users without a stable workbench may struggle to achieve the required ±0.02 mm accuracy, leading to poor fit and wasted blanks.
What's in the box?
The box contains 1 × adjustable jig base, 2 × drill guide plates, 1 × set of hardened steel pins, 4 × M3×12 mm screws, and a 12‑page CNC‑friendly layout PDF. All components are labeled for quick assembly.
Is the Polymer80 PF940C Jig Kit worth it at $50.99?
Yes, at $50.99 the kit delivers a $120‑value in time savings and reduced material waste. Builders typically see a 20% reduction in scrap rates, translating to a net saving of $30‑$45 per build.
For more frame options see the .308 80% Lower – Billet or read the Complete FAQ on the 80% Lower Registration Process for compliance guidance.
Key attributes
| Caliber | 9mm |
| Frame Size | Full-size PF940C |
| Weight | 1.3 lb (590 g) |
| Dimensions | 9.5 x 6.2 x 2.1 in (241 x 158 x 53 mm) |
| Material | Hardened steel pins, polymer base |
| Condition | New |
Frequently asked questions
- Is it compatible with a 3‑inch drill press?
- Yes, the jig is sized for a standard 3‑inch drill press throat and uses M3 mounting holes. The alignment plates sit flush on the table, providing stable guidance for the 5 mm drill bit.
- Does it fit the PF940C frame blank from Polymer80?
- The jig is cut specifically for the PF940C blanks released by Polymer80. It accommodates the blank’s 1.75 in (44.5 mm) width and 3.2 in (81 mm) length without modification.
- How long does shipping take?
- Standard US shipping averages 3–5 business days, with expedited options delivering in 1‑2 days. All kits are dispatched within 24 hours of order confirmation.
- Can I return it if it doesn't fit?
- Returns are accepted within 30 days if the jig components are unused and in original packaging. A restocking fee of 15% applies, covering handling costs.
- Does this work with a VFD‑compatible milled lower?
- The jig aligns the trigger and fire control holes for VFD‑compatible lowers, but you must verify that the VFD’s mounting points are not offset beyond the 0.02 mm tolerance.