MAS DEFENSE Frame Rail Kit for PF-Series Polymer80 Standard G17/G22 – Complete Lower Rail System
$75.00
Upgrade your Polymer80 PF940 build with this complete MAS DEFENSE frame rail kit. Precision-machined for perfect fit with G17/G22 slides, includes all necessary rails and hardware for reliable assembly.
Complete Your Polymer80 PF940 Build with MAS DEFENSE Frame Rail Kit
Transform your Polymer80 PF940 frame into a fully functional firearm with this comprehensive MAS DEFENSE Frame Rail Kit. Designed specifically for compatibility with PF-Series Polymer80 Standard frames (G17/G22), this complete lower rail system provides everything you need for a secure, reliable build that meets exacting standards.
Why Choose This MAS DEFENSE Rail Kit?
- Perfect Compatibility: Engineered specifically for Polymer80 PF940 Standard frames, ensuring precise fit with G17 and G22 slides
- Complete System: Includes all necessary rails and mounting hardware for straightforward installation
- Precision Machined: Manufactured to tight tolerances for consistent performance and reliability
- Enhanced Stability: Provides solid foundation for slide operation and improved shooting accuracy
- Durable Construction: Built to withstand regular use while maintaining structural integrity
Key Features and Benefits
This MAS DEFENSE Frame Rail Kit represents the essential component for completing your Polymer80 build. The kit includes precisely machined rails that interface perfectly with your PF940 frame, creating the necessary platform for slide installation and operation. Unlike generic rail systems, this kit is specifically designed for Polymer80’s unique frame geometry, eliminating compatibility issues and ensuring proper alignment.
Each component undergoes rigorous quality control to maintain dimensional accuracy and surface finish. The result is a rail system that provides smooth slide movement, consistent lockup, and reliable performance shot after shot. Whether you’re building your first Polymer80 or adding to your collection, this rail kit delivers the foundation needed for a successful custom firearm project.
Technical Specifications
The MAS DEFENSE Frame Rail Kit includes front and rear rail sections specifically contoured for Polymer80 PF940 Standard frames. The system accommodates standard G17 and G22 slides while providing proper slide-to-frame engagement. All necessary mounting hardware is included, with precisely threaded holes and properly torqued fasteners for secure installation.
Why Buy from Rare Breed Triggers FRT-15?
Expertise You Can Trust: Our team specializes in firearm components and understands the specific requirements of Polymer80 builds. We’ve tested this rail kit extensively to ensure it meets our quality standards.
Experience Matters: With years in the firearms industry, we know what makes a reliable build. This rail kit has been selected based on its proven performance and compatibility.
Authoritative Selection: We carefully curate our inventory to include only products that deliver consistent results. This MAS DEFENSE kit represents the quality we stand behind.
Trustworthy Service: Your satisfaction is our priority. We provide detailed product information and support to ensure your build succeeds. For more quality firearm components, explore our complete selection at FRT-15.com.
Installation and Compatibility
This rail kit is designed for straightforward installation on Polymer80 PF940 Standard frames. The included hardware matches factory specifications, and the rail geometry aligns perfectly with G17 and G22 slide configurations. While installation requires basic gunsmithing skills, the precise machining ensures proper fit without extensive modification.

Ideal For
- Polymer80 PF940 Standard frame builds
- G17 and G22 slide compatibility projects
- Custom firearm enthusiasts seeking reliable components
- Builders requiring precise rail systems for optimal performance
Complete Your Build Today
Don’t let your Polymer80 project stall due to missing components. This MAS DEFENSE Frame Rail Kit provides the essential foundation for completing your G17/G22 compatible build. With its precise engineering and complete hardware package, you can move forward with confidence knowing you have quality components that fit correctly and perform reliably.
| Compatibility | Polymer80 PF940 Standard Frames |
| Slide Compatibility | Glock 17 / Glock 22 Slides |
| Caliber Compatibility | 9mm, .40 S&W |
| Kit Contents | Front Rail, Rear Rail, Mounting Hardware |
| Material | Steel (Machined) |
| Finish | Black Oxide/Phosphate |
| Manufacturer | MAS DEFENSE |
| Installation | Requires Basic Gunsmithing Skills |
Buy Firearms Online – Reliable & Affordable
This MAS DEFENSE Frame Rail Kit for PF-Series Polymer80 Standard G17/G22 – Complete Lower Rail System is ideal for shooters looking to buy guns online with confidence. Built with precision engineering and tested performance, it’s a top-tier choice whether you're looking for home defense, sport shooting, or a trusted everyday carry.
Why Choose the MAS DEFENSE Frame Rail Kit for PF-Series Polymer80 Standard G17/G22 – Complete Lower Rail System?
- ✅ Quality guaranteed by top firearm manufacturers
- ✅ Ships fast across the USA
- ✅ Legal compliance and background-check ready
Buy Firearms Near Me – Nationwide Delivery
No matter your location, we ship to all 50 states. Looking for where to buy Accessories near you? FRT-15.com brings the best selection to your door, legally and securely.
Shipping & Return Policy
- 📦 Fast shipping within 1–3 business days
- 🔁 30-day return policy for unused, unmodified items
- 💬 Questions? Contact our support team
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| Brand | MAS Defense |
|---|---|
| Caliber | 9mm/.40 S&W |
| Model | PF940S |
| UPC | MAS-PF940S-LBRS-SRRM |



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