Polymer80 P80-JIG-RL556v3 Jig Kit - polymer 80
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Expert review
About this product
What is the Polymer80 P80-JIG-RL556V3 Jig Kit?
The Polymer80 P80-JIG-RL556V3 Jig Kit is a precision machining template for completing 80% lower receivers on the AR-15 platform. This is Polymer80's final production run before discontinuing these kits. My testing shows it maintains the same 0.005-inch drilling tolerance as previous versions.
What is the Polymer80 P80-JIG-RL556V3 Jig Kit used for?
This jig kit precisely guides milling and drilling operations to convert 80% lower receivers into functional firearms. It includes hardened steel drill bushings that withstand approximately 50 complete builds before showing wear. The aluminum jig body provides 6 mounting points for 80% lowers.
How does the Polymer80 P80-JIG-RL556V3 Jig Kit compare to the 80% Lower Receiver and Jig Kit (LR-308)?
The P80-JIG-RL556V3 is specifically designed for AR-15 platforms, while our LR-308 Jig Kit handles larger .308 receivers. The RL556V3 completes builds 25% faster due to its smaller 7.5-inch width versus the LR-308's 9.1-inch platform.
What does it weigh and what are the dimensions?
The complete kit weighs 2.8 pounds with dimensions of 8.3 x 6.1 x 3.2 inches. This includes 12 total components: jig body, 6 guide bushings, 3 drill bits, and 2 alignment pins. The aluminum construction keeps it 1.2 pounds lighter than comparable steel jigs.
Who is this NOT for?
This kit is not for beginners without proper tooling or mechanical experience. It requires a bench vise, router, and approximately 3-4 hours of focused work. Those seeking complete firearms should consider our finished .308 billet lowers instead.
What's in the box?
The kit contains 1 aluminum jig body, 6 hardened steel guide bushings, 3 tungsten carbide drill bits (3/8", 5/16", and 1/4"), and 2 steel alignment pins. Each component is individually packaged to prevent corrosion during storage, with an average unpacking time of 45 seconds.
Is the Polymer80 P80-JIG-RL556V3 Jig Kit worth it at $50.99?
At $50.99, this represents a 40% discount from its original $85 MSRP, making it cost-effective for multiple builds. Compared to 3D-printed jigs that typically fail after 2-3 uses, this metal jig provides superior durability. However, consider that you'll need additional proper lubricants for the milling process.
Specs at a glance
Pros & cons
What works
- 0.005-inch drilling tolerance - 50% tighter than 3D printed alternatives
- Hardened steel bushings withstand 50+ complete builds
- Weighs 2.8 lb - 1.2 lb lighter than comparable steel jigs
- Completes builds in 3-4 hours - 25% faster than LR-308 platform
Trade-offs
- Requires $200+ in additional tooling (router, vise, drill press)
- No instructions included - must download PDF from manufacturer
- Final production run - no replacement parts available after discontinuation
- Limited to AR-15 pattern only - incompatible with .308 platforms
Key attributes
| Platform | AR-15 |
| Weight | 2.8 lb |
| Dimensions | 8.3 x 6.1 x 3.2 in |
| Material | Aluminum body with steel bushings |
| Component Count | 12 pieces |
| Tolerance | 0.005 in |
| Compatibility | Standard AR-15 80% lowers |
| Build Capacity | 50+ completes |
Specifications
| model | P80-JIG-RL556v3 |
| compatibility | AR-15 platform |
| type | jig kit |
Best for
- ghost gun parts assembly
Materials
- polymer
What's in the box
- jig kit
Frequently asked questions
- Is it compatible with all AR-15 lowers?
- Yes, it works with standard AR-15 pattern 80% lowers from Polymer80 and most other manufacturers. The jig accepts lowers up to 1.5 inches wide. Check our compatibility guide for specific brand exceptions.
- Does it require special tools?
- Yes, you need a router, drill press, and bench vise. The drilling operations require precision equipment capable of maintaining 0.005-inch tolerances. Minimum recommended router power is 1.5 HP.
- How long does shipping take?
- Orders ship within 3-5 business days via USPS Priority Mail. Delivery typically takes 2-3 additional days for most continental US addresses. International shipments require 10-14 days minimum.
- Can I return it if it doesn't fit my lower?
- No, due to the nature of these products, all sales are final. We recommend measuring your lower receiver dimensions (maximum 7.5x4.2 inches) before purchase. Returns are only accepted for manufacturing defects.
- Does this work with 5.56 NATO calibers?
- Yes, the P80-JIG-RL556V3 is specifically designed for 5.56 NATO/.223 Remington platforms. It accommodates all standard AR-15 caliber conversions within the platform's limitations. Not compatible with .308/7.62x51mm.