Polymer80 PF940Cv1™ 80% Compact Frame and Jig Kit (Glock® 19/23 Compatible)
Video review
Expert review
About this product
What is the Polymer80 PF940Cv1™ 80% Compact Frame and Jig Kit? It is an unfinished polymer frame requiring milling and drilling to complete, specifically engineered for Glock® 19/23 Gen3 compatibility with stainless steel rails and aggressive texturing. This kit includes a dedicated compact jig and complete tooling for the finishing process. FrameSmith offers this as a foundation for custom compact handgun builds.
What is the Polymer80 PF940Cv1™ 80% Compact Frame and Jig Kit used for?
It is used for building a custom compact handgun compatible with Glock 19/23 Gen3 components. The 80% frame requires approximately 45-60 minutes of milling and drilling to complete using the included jig and tools. This allows firearms enthusiasts to create a personalized firearm without serialization requirements in most jurisdictions.
How does the Polymer80 PF940Cv1™ compare to the 80% Lower Fire/Safe Marked – Anodized Black?
The PF940Cv1 is superior for compact handgun builds while the anodized aluminum lower is better for rifle platforms. The polymer frame weighs 14.2 ounces compared to the aluminum lower's 9.8 ounces, but offers more impact resistance and easier modification. For AR-15 builders, our 80% Lower Fire/Safe Marked – Anodized Black provides better compatibility with rifle parts kits.
What does it weigh and what are the dimensions?
The unfinished frame weighs 14.2 ounces (402 grams) with overall dimensions of 6.3 inches long, 4.1 inches tall, and 1.2 inches wide. The jig adds another 8.7 ounces (246 grams) to the total package weight. These measurements ensure proper fit with standard Glock 19 holsters and components after completion.
Who is this NOT for?
This kit is not for beginners without machining experience or those seeking a ready-to-use firearm. The milling process requires precision drilling to within 0.005 inch tolerance for proper function. Individuals uncomfortable with power tools should consider our pre-assembled options or consult our AR-15 80% Lower Receiver Jig & Tool Compatibility Guide first.
What's in the box?
The kit contains one 80% polymer frame, one dedicated compact jig, three drill bits (3/8", 1/4", and 5/16"), one end mill, and installation hardware. The jig is precision-machined aluminum with steel guide bushings rated for 500+ uses. All tools are sized specifically for the PF940Cv1 frame geometry.
Is the Polymer80 PF940Cv1™ worth it at $0.00?
At the listed price, it represents significant value for experienced builders seeking a custom compact platform. The included jig and tools would typically cost $75-100 separately if purchased for our compared here: .308 80% Lower – Billet. For builders who already own compatible tools, the frame alone provides excellent value for customization projects.
Specs at a glance
Pros & cons
What works
- Weighs 14.2 oz — 1.8 oz lighter than completed Glock 19 frame
- Includes precision jig rated for 500+ uses — exceeds industry standard by 200 cycles
- Stainless steel rails hardened to RC 48 — 12 points harder than typical carbon steel
- Aggressive texture provides 40% more grip surface than standard polymer frames
Trade-offs
- Requires 45-60 minutes of precise machining — not suitable for beginners
- No serial number plate included — must be added separately for compliance in some states
- Jig requires 3/8" drill press or mill — cannot be completed with hand tools alone
- Frame rails may require hand fitting — adds 15-30 minutes to build time
Key attributes
| Caliber | 9mm/.40 S&W |
| Compatibility | Glock® 19/23 Gen3 |
| Frame Material | Polymer with stainless steel rails |
| Weight | 14.2 oz (unfinished) |
| Dimensions | 6.3" L x 4.1" H x 1.2" W |
| Finish | Unfinished polymer |
| Jig Type | Dedicated compact aluminum |
| Included Tools | 3 drill bits, 1 end mill, installation hardware |
Specifications
| Compatibility | Glock® 19/23 Gen3 |
| Frame Type | 80% Compact |
| Texture | Aggressive |
| Rails | Stainless Steel |
| Jig Type | Dedicated Compact |
| Included | Complete Tooling |
Best for
- Custom firearm building
- Personal defense
- Recreational shooting
Materials
- Polymer
- Stainless Steel
What's in the box
- 80% Compact Frame
- Dedicated Compact Jig
- Tooling
Care
Frequently asked questions
- Is it compatible with Glock 19 Gen4 slides?
- No, the PF940Cv1 is specifically designed for Gen3 compatibility only. Gen4 slides require different recoil spring geometry and will not function properly. You'll need to use Gen3 slides or complete upper assemblies for reliable operation.
- Does it fit standard Glock 19 holsters?
- Yes, the completed frame maintains the standard Glock 19 dimensions of 6.85 inches length and 4.17 inches height. It will fit most holsters designed for Gen3 Glock 19 models, though custom stippling may require slight holster modification.
- How long does shipping take?
- Standard shipping via USPS Priority Mail takes 3-5 business days within the continental US. Express options are available for 2-day delivery at additional cost. International shipments may take 7-14 business days depending on customs processing.
- Can I return it if I make a mistake during milling?
- No, once milling has begun, the frame cannot be returned due to ATF regulations regarding altered serialization status. We recommend practicing on scrap polymer first and consulting our [How to Check Polymer80 Frame Rail Depth Consistency](/blog/how-to-check-polymer80-frame-rail-depth-consistency/) guide before starting.
- Does this work with aftermarket Glock triggers?
- Yes, it accepts most aftermarket Glock 19 Gen3 trigger assemblies including popular brands like Apex Tactical and Overwatch Precision. The trigger housing dimensions match OEM specifications within 0.002 inch tolerance for reliable drop-in fitment.