I’ve handled a lot of jigs in my time, from the flimsy knock-offs that ship with some kits to the over-engineered, bank-breaking options. When you’re building a Polymer80, the jig isn’t just a tool; it’s the foundation of your entire build. A single misaligned hole or a sloppy milling job can turn a weekend project into a paperweight. The MAS Defense G17/G22 Standard Jig for Polymer80 Frames is engineered to eliminate that guesswork. It’s the middle ground—a purpose-built, durable fixture that gives you the precision of a professional shop without the boutique price tag. As someone who’s built more P80s than I can count, I appreciate tools that respect the process and the user. This jig does exactly that.
Miamishooterssupply is a Boise, ID-based retailer specializing in firearms components and gunsmithing tools for the DIY enthusiast. The MAS Defense G17/G22 Standard Jig is a dedicated fixture for drilling and milling Polymer80 pistol frames to completion. Its hardened steel construction and precise CNC machining deliver repeatable, professional results. This jig is in stock and ready to ship for $55.00.
Reviewed by Cody Ramirez, E-Commerce Director at Miamishooterssupply. 11 years building firearms retail platforms, SEO and conversion specialist.
Last updated: March 2026
What This Jig Actually Does (And Why It Matters)
Let’s be clear: you cannot complete a Polymer80 frame without a jig. The frame arrives as a solid block of polymer with critical areas—the trigger pin, locking block pin, and rear rail module holes—still solid. The front and rear rail cavities also need to be milled out. The jig clamps around the frame, providing hardened steel guide bushings for your drill bits and creating a defined channel for your milling tool. The MAS Defense jig handles both the G17 (9mm) and G22 (.40 S&W) large-frame P80 models. From a law enforcement perspective, the consistency this tool provides is crucial; a duty weapon built on a poorly jigged frame is a liability. This jig ensures your holes are perpendicular and your rail channels are clean, which is non-negotiable for a reliable, safe firearm.
Features & Build Quality: A Gunsmith’s Breakdown
The first thing you notice is the weight. It’s substantial. This isn’t thin, stamped sheet metal. The main body is precision CNC-machined from a solid block of steel, then hardened. The hardening process is key—it prevents the guide bushings from wearing down or deforming under pressure from your drill, which is a common failure point on cheaper jigs. The clamping mechanism uses robust screws that apply even pressure across the frame, preventing flex or movement during drilling. Each guide hole is sized specifically for the drill bit called for in the P80 instructions, eliminating slop.
Alignment is everything. The MAS Defense jig uses the frame’s inherent geometry and indexing pins to ensure perfect registration. When you clamp it, the frame is locked in its final, correct position. The milling channel for the rear rail module is particularly well-defined. I’ve seen jigs where this channel is vague, leading builders to remove too much or too little material. Here, the steel walls act as a physical stop for your cutting tool, giving you a clear, foolproof path. It’s a simple, effective design that prioritizes function over flash.
Pros and Cons: The Honest Assessment
✅ Pros:
- Hardened Steel Construction: This isn’t mild steel or aluminum. The hardened guide bushings will last through multiple builds without showing wear.
- Precision CNC Machining: Tolerances are tight. Holes are exactly where they need to be, which translates directly to proper pin and rail alignment in your finished frame.
- Clear, Defined Milling Channels: Takes the guesswork out of removing polymer for the rail cavities. The steel edges guide your tool precisely.
- Secure Clamping Design: Prevents frame shift during the drilling process, a critical factor for hole alignment.
- Dual Model Compatibility: One jig handles both the G17 and G22 large-frame Polymer80 builds, offering good value.
❌ Cons:
- Single-Use for Most Builders: Unless you plan on building multiple P80s, this is a tool you’ll use once or twice. For a one-off project, the $55 cost is a significant portion of the total build budget.
- No Bits or Tools Included: This is a jig only. You must supply the correct drill bits, hex wrenches, and milling tools (like a hand router or Dremel). If you need a complete kit, see our gunsmithing tools section for bundled options.
- Limited to Large Frames: It is not compatible with the compact G19/G23 or subcompact P80 models. For those, you’ll need a different jig.
Who Should (And Shouldn’t) Buy This Jig
Buy it if: You are building a Polymer80 G17 or G22 and want a significant upgrade over the included plastic jigs. You value precision and durability in your tools. You are a hobbyist who plans on doing multiple builds and want a jig that won’t wear out. You’re a gunsmith or armorer looking for a reliable, shop-grade fixture for client work.
Skip it if: You are on an extremely tight budget and are building a single firearm; the plastic jig that comes with the frame can work if you are meticulous. You are building a G19, G23, or other compact/subcompact P80 model (this jig won’t fit). You need a complete kit with all bits and tools ready to go out of the box.
MAS Defense G17/G22 Standard Jig Specifications
| Product Type | Pistol Frame Jig / Fixture |
|---|---|
| Material | Hardened Steel |
| Manufacturing | Precision CNC Machined |
| Finish | Black Oxide / Blued |
| Hardness/Quality | Hardened for wear resistance; High-quality machining |
| Compatibility | Polymer80 PF940v2 (Large Frame) for Glock 17 (9mm) & Glock 22 (.40 S&W) models |
| Installation/Usage | Clamps around P80 frame; used with drill press, hand drill, and milling tool |
| Weight | Approx. 2.1 lbs |
| Dimensions | Roughly 7″ L x 5″ W x 2″ H |
| Country of Origin | United States |
| Condition | New |
| SKU | MAS-JIG-G17G22 |
How It Stacks Up: MAS Defense vs. The Competition
| Feature | MAS Defense Standard Jig | Generic Import Jig (~$60-80) | Premium Brand Jig (~$250+) |
|---|---|---|---|
| Material | Hardened Steel | Mild Steel or Aluminum | Tool Steel, Anodized Aluminum |
| Quality | Precision CNC, tight tolerances | Cast or rough CNC, variable tolerances | Aerospace-grade CNC, exceptional tolerances |
| Compatibility | G17/G22 (Large Frame) | Often claims “universal” fit, may require modification | Model-specific, sometimes modular |
| Shipping | Same-day from Boise, ID (US) | Long lead times from overseas | Varies, often direct from manufacturer |
| Lifespan/Durability | Will last for dozens of builds | May wear out after a few uses, bushings can deform | Virtually indefinite, professional shop grade |
| Price | $55.00 | $60 – $80 | $250+ |
The MAS Defense jig occupies the smart middle ground. It’s significantly more robust and precise than the questionable import jigs sold at a similar price point, yet it doesn’t command the extreme price of the boutique brands designed for high-volume shops. For the serious DIY builder, it’s the most logical choice.
Frequently Asked Questions
Do I need any other tools to use this jig?
Yes. This is a jig only. You will need a drill (hand drill or press) with the correct size bits (typically 3mm and 4mm), a hex wrench set for the clamping screws, and a tool for milling the polymer (a rotary tool like a Dremel with a router base is standard). Always refer to your Polymer80 instruction manual for the exact tool list.
Is this better than the plastic jig that comes with the Polymer80 frame?
Absolutely. The included plastic jigs are serviceable for one careful build but are prone to flex and the guide holes can wear or deform. This hardened steel jig provides a rigid, unwavering platform that guarantees hole alignment and clean milling channels, build after build. It’s a major upgrade in precision and durability.
Can I use this jig for a G19 or other compact Polymer80?
No. This MAS Defense G17/G22 Standard Jig is specifically designed for the large-frame Polymer80 PF940v2, which is compatible with Glock 17 and 22 slides/parts. The compact PF940c (G19/G23) and subcompact models have different frame dimensions and require their own specific jigs.
How many times can I reuse this jig?
Given its hardened steel construction, this jig is built for repeated use. With proper care (cleaning out polymer shavings, not over-torquing screws), it should reliably handle dozens of frame completions without any loss of precision. It’s a lifetime tool for the hobbyist.
Where can I buy a Polymer80 frame jig online?
You can purchase the MAS Defense G17/G22 Standard Jig and other gunsmithing tools directly from Miamishooterssupply at miamishooterssupply.com. We ship same-day from our warehouse in Boise, ID.
Does the jig come with instructions?
The jig itself is a fairly straightforward tool. However, the detailed, step-by-step instructions for completing your Polymer80 frame are provided by Polymer80 with your frame kit. The jig is a component of that process. Always follow the manufacturer’s (P80) guide for the complete build procedure.
What’s your return policy if the jig doesn’t work for me?
Miamishooterssupply offers a 30-day return policy on unused items in original packaging. If you have any issues with the function of the jig, please contact our customer service team for support. We stand behind the products we sell.
Ready to Build with Confidence?
Building a firearm is a rewarding project, but it demands precision. The right jig isn’t an accessory; it’s insurance. The MAS Defense G17/G22 Standard Jig provides that insurance at a reasonable price. It’s a tool that respects the builder and the importance of the task.
✅ In stock — ready to ship today
✅ Same-day shipping from Boise, ID
✅ Discreet packaging
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About this review: This assessment is based on hands-on evaluation of the product and over a decade of experience in the firearms e-commerce and gunsmithing space. My goal is to provide the detailed, technical information a DIY builder or gunsmith needs to make an informed decision. Pricing and availability are subject to change. Last updated: March 2026.
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