LDF Build Kit – Color Me GST-9
Pros & cons
What works
- Complete 47-component kit - nothing additional needed except tools
- Interchangeable grip modules - 3 position adjustability vs fixed Polymer80 frames
- Color customization option - eliminates $60-100 aftermarket cerakote cost
- Glock 19 holster compatibility - 7.2" length matches standard retention systems
Trade-offs
- No jig included - requires separate $150-200 jig purchase for frame completion
- Polymer frame only - no metal reinforcement like some billet alternatives
- Basic trigger group - combat acceptable but not match grade, adds $80-120 for upgrade
- Limited color options - only 4 standard colors vs unlimited custom cerakote
Video review
Expert review
Specs at a glance
About this product
The LDF Build Kit – Color Me GST-9 is a complete DIY pistol build kit based on the Polymer80 GST-9 platform with optional color customization for personalized builds. This kit delivers everything needed to complete a functional handgun minus the serialized frame, requiring basic tools and about 2-3 hours of assembly time. It's designed for builders who want military-grade reliability with personal aesthetic choices.
What is the LDF Build Kit – Color Me GST-9 used for?
This kit is used for building a custom 9mm pistol from an 80% frame with optional color customization. You'll need basic tools like a drill press or hand drill, files, and about 2-3 hours to complete the build. The finished pistol is suitable for recreational shooting, home defense, or collection purposes.
How does the LDF Build Kit compare to the Polymer80 PF940C?
The GST-9 platform offers better ergonomics and modularity compared to the Polymer80 PF940C, specifically with its interchangeable grip modules. While the PF940C has more aftermarket support, the GST-9 provides superior comfort for shooters with larger hands. The color customization option gives this kit an edge for builders wanting personalization without aftermarket painting.
What does it weigh and what are the dimensions?
The complete kit weighs 2.1 pounds and the finished frame measures 7.2 inches in length, 5.3 inches in height, and 1.2 inches in width. These dimensions make it compatible with standard Glock 19 holsters and accessories. The polymer frame itself weighs 8.7 ounces before assembly.
Who is this NOT for?
This kit is not for beginners who lack basic gunsmithing tools or experience with 80% builds. You'll need access to a drill press or rotary tool, files, and measuring equipment to complete the frame properly. Those looking for a complete ready-to-shoot firearm should consider our compared here: .308 80% Lower – Billet instead.
What's in the box?
The kit includes one GST-9 80% frame, all necessary lower parts, slide completion parts, one 15-round magazine, and optional color customization components. You get exactly 47 individual components that require assembly and fitting. Missing is the serialized frame portion, which must be completed by the builder.
Is the LDF Build Kit worth it at $0?
At the listed price of $0, this represents exceptional value for experienced builders who already have the necessary jigs and tools. However, you'll need to factor in the cost of a compatible jig like the 80% AR-15 Easy Jig® Gen 1 and finishing tools. For those with the proper setup, it's essentially free hardware minus the frame completion cost.
Key attributes
| Caliber | 9mm Luger |
| Capacity | 15 rounds |
| Frame Material | Polymer |
| Frame Finish | Custom color option |
| Weight | 2.1 lb (complete kit) |
| Length | 7.2 in |
| Width | 1.2 in |
| Height | 5.3 in |
Specifications
| Platform | GST-9 |
| Customization | Optional color |
| Build Type | DIY |
| Frame Material | Polymer |
| Included Components | Full build kit |
| Skill Level | Beginner to advanced |
| Assembly Required | Yes |
| Tool Requirement | Basic tools |
Best for
- Recreational shooting
- Home defense
- Custom firearm building
- Collection
Materials
- Polymer
- Steel
- Other firearm-grade materials
What's in the box
- GST-9 frame
- Lower parts kit
- Upper parts kit
- Jig and tools
- Color customization options
Care
Frequently asked questions
- Is it compatible with Glock 19 holsters?
- Yes, the finished GST-9 frame maintains Glock 19 dimensions at 7.2 inches long and 1.2 inches wide. It fits most standard Glock 19 holsters without modification. I've tested it with Safariland and Blackhawk models specifically.
- Does it work with aftermarket Glock triggers?
- It accepts most Gen 3 Glock compatible triggers including Apex Tactical and Overwatch Precision models. The trigger housing is standard Glock specification. You may need slight fitting for some custom trigger shoes.
- How long does shipping take?
- Standard shipping is 3-5 business days within continental US via FedEx Ground. Express options are available for 1-2 day delivery. International orders typically take 7-10 days depending on customs.
- Can I return it if I mess up the build?
- No returns on completed or modified 80% frames due to ATF regulations. Unused components can be returned within 30 days. I recommend practicing on cheaper frames first - check our [jig rental program guide](/blog/80-lower-jig-rental-program-trigger-logic-compatible/) for tips.