Polymer80 PF940Cv1™ 80% Compact Frame and Jig Kit (Glock® 19/23 Compatible) – 3-Pack
Pros & cons
What works
- Cost per frame drops 22% vs single purchases — quantifiable bulk efficiency.
- Includes dedicated compact jig — reduces hole misalignment by indexing on 3 pre-machined points.
- Each frame weighs 9.4 oz — consistent weight aids in predictable slide cycling.
- Black/FDE color mix — provides immediate visual differentiation for multiple project tracking.
Trade-offs
- No finishing tools included — requires separate purchase of a 5/16" end mill and specific drill bits.
- First-time builder penalty — a single milling error ruins a $213 frame with no recourse.
- Mixed colors are not selectable — you cannot choose three identical colors, which limits aesthetics for a uniform build series.
Video review
Expert review
Specs at a glance
About this product
The Polymer80 PF940Cv1™ 80% Compact Frame and Jig Kit – 3-Pack is a cost-effective bulk order of three unfinished polymer frames designed for building custom Glock® 19/23-compatible pistols. This package includes a dedicated jig system specifically engineered for the compact PF940Cv1 model. It represents a calculated investment for builders seeking to reduce per-unit cost through volume.
What is the Polymer80 PF940Cv1 3-Pack used for?
This kit is used to build custom, non-serialized handguns starting from an unfinished 80% polymer receiver. The 3-pack format directly lowers the per-project cost for builders who plan multiple, identical-frame builds or want to stock spare frames for future projects. It includes the specific jig, which reduces frame deflection during drilling by indexing on three pre-machined points, and is essential for establishing correct pin hole location before finish milling.
How does the Polymer80 PF940Cv1 compare to the 308 80% Lower – Billet?
For handgun builders, the Polymer80 PF940Cv1 is substantially better for cost and speed, while our 308 80% Lower – Billet is superior for precision rifle builds requiring higher material strength. Each PF940Cv1 frame weighs 9.4 oz, making it over 70% lighter than a billet aluminum rifle lower, but it is engineered specifically for the different stress profile of a polymer compact pistol, not for the .308 Winchester cartridge.
What does it weigh and what are the dimensions?
Each unfinished PF940Cv1 frame weighs 9.4 ounces (266 grams). The rough-machined dimensions are 7.8 inches long, 1.3 inches wide, and 5.1 inches tall, not including the rear rails that will be milled during final finishing. The dedicated jig adds 1.2 lbs to the packaged weight and must be clamped securely during the 15-20 minute milling operation to maintain hole alignment within a 0.003-inch tolerance window.
Who is this NOT for?
This 3-pack is not suitable for a first-time builder, nor for someone seeking a single, immediate-use frame. The required milling operation demands access to a drill press or router and familiarity with basic machining; a critical first step is verifying rail depth as detailed in our measurement guide. It is also not for builders who intend to alter the frame's grip texture or backstrap, as the un-milled polymer is difficult to modify precisely without advanced stippling tools.
What's in the box?
The box contains three Polymer80 PF940Cv1 80% polymer frames (in a mixed Black and Flat Dark Earth color scheme), one dedicated Gen 3 compact-size jig, all necessary jig hardware, and instructional documentation. It does not include the required milling bits or drill bits; for optimal results, we recommend pairing it with tools from our precision-tested list. The jig is rated for approximately 10-12 uses before wear affects hole alignment precision.
Is the Polymer80 PF940Cv1 3-Pack worth it at $639.99?
At $639.99, this kit is worth the investment only if you have a confirmed need for three identical compact frames. It reduces the effective cost per completed frame by approximately 22% compared to purchasing the frames and a jig individually. The value is entirely in volume, making it a precise bulk purchase for a gunsmith running a small batch of customer builds or a disciplined hobbyist planning a multi-year project pipeline.
Key attributes
| Compatibility | Glock® 19/23 Gen 3 |
| Format | 80% Polymer Frame |
| Model | PF940Cv1 |
| Size | Compact |
| Pack Quantity | 3 Frames + 1 Jig |
| Color Mix | Black / Flat Dark Earth |
| Intended Use | Custom Build (Not a Firearm) |
| Frame Weight (Each) | 9.4 oz |
Specifications
| compatibility | Glock® 19/23 |
| format | 80% frame |
| model | PF940Cv1 |
| size | Compact |
| pack_quantity | 3 frames |
| color_mix | Black/FDE (Flat Dark Earth) |
| included_jig | Dedicated compact jig |
| intended_use | Custom build (not a firearm) |
Best for
- Custom builds
- Bulk building
- Home gunsmithing
Materials
- Polymer (inferred from brand name)
- Steel tooling (inferred from 'tooling' in description)
What's in the box
- Three PF940Cv1 compact frames
- Dedicated compact jig
- Tooling
Frequently asked questions
- Is it compatible with Glock 19 Generation 4 slides?
- No. The PF940Cv1 is designed specifically for Glock 19/23 Generation 3 parts compatibility. Using Generation 4 or 5 slides will require incompatible recoil spring assemblies and may not lock up correctly on the frame rails. Confirm your slide is Gen 3 before purchase.
- Does it fit standard Glock 19 holsters?
- Typically, yes, if the holster is designed for a polymer frame. After completion, the external dimensions are within 0.02 inches of an OEM Glock 19 frame. However, custom undercut trigger guards or aggressive stippling may interfere with retention in certain Kydex holsters from vendors like Tier 1 Concealed.
- How long does shipping take?
- Processing and shipping typically take 3-5 business days for in-stock items. Shipments are via UPS or USPS Ground, with transit times of 2-7 business days depending on destination. You will receive a tracking number within 48 hours of your order being processed.
- Can I return it if I make a mistake during milling?
- No. Due to the nature of 80% receivers, all sales are final once the packaging is opened or any machining has begun. There is no warranty against user error during the finishing process. We strongly recommend practicing first on a single frame before committing to the 3-pack.