Release: Glock-Mod Polymer80 P80-JIG-RL556v3 Jig Kit
About this product
What is the Glock-Mod Polymer80 P80-JIG-RL556v3 Jig Kit? This is a specialized machining fixture designed to convert 80% AR-15 lower receivers into functional firearms with precision alignment for trigger pocket milling and pin drilling operations. This jig represents the evolution of Polymer80's tooling system, optimized specifically for compatibility with forced reset trigger systems requiring tighter tolerances. The RL556v3 designation indicates third-generation refinement with enhanced clamping pressure and improved drill bushing alignment over previous versions.
What is the Glock-Mod Polymer80 P80-JIG-RL556v3 Jig Kit used for?
This jig kit enables precise completion of 80% AR-15 lower receivers to exact firearm manufacturing specifications. It provides hardened steel drill bushings that guide standard 3mm and 5mm bits for trigger and hammer pin holes, plus carbide-tipped end mills for trigger pocket milling. The system maintains ±0.002 inch positional accuracy throughout the 45-60 minute completion process, ensuring proper function with drop-in trigger systems.
How does the Glock-Mod Polymer80 P80-JIG-RL556v3 Jig Kit compare to the 5D Tactical Pro Jig?
The RL556v3 offers superior trigger pocket alignment specifically for FRT systems but requires more manual operation than the 5D Tactical Pro Jig. While the 5D system uses router-based automation for faster completion in under 20 minutes, our jig provides tactile feedback that prevents over-milling common with polymer lower receivers. For builders prioritizing FRT compatibility over speed, the RL556v3 delivers tighter control of trigger pocket depth and geometry.
What does it weigh and what are the dimensions?
The complete jig kit weighs 2.8 pounds and measures 8.5 x 4.25 x 3.1 inches in its assembled configuration. The hardened steel drill bushings add 11.2 ounces to the total weight, while the aluminum jig frames contribute the remaining mass. This compact package fits standard bench vises with 4-inch jaw capacity and stores in most range bags.
Who is this NOT for?
This jig kit is not suitable for first-time builders without prior machining experience or proper safety equipment. The milling process generates aluminum chips at 2,500-3,500 RPM that require eye protection and secure workpiece clamping. Consider our drop-in connector kits if you lack access to a drill press or milling machine.
What's in the box?
The kit includes the two-piece aluminum jig body, three hardened steel drill bushings for pin holes, one carbide-tipped end mill for trigger pocket milling, and six T15 torx fasteners for assembly. Each package contains exactly 12 components total, with the end mill rated for 15-20 complete lower receivers before requiring sharpening or replacement.
Is the Glock-Mod Polymer80 P80-JIG-RL556v3 Jig Kit worth it at $57.62?
At $57.62, this jig delivers professional-grade precision at 40% less than competing systems requiring additional template purchases. The investment pays for itself after completing 2-3 lower receivers compared to gunsmith fees averaging $75-100 per completion. For builders planning multiple AR-15 builds with FRT trigger systems, the RL556v3 provides reliable repeatability that justifies the cost.
Specs at a glance
Video review
Pros & cons
What works
- Hardened steel bushings maintain ±0.002 inch accuracy over 20+ uses
- 2.8 pound total weight provides stability without bench vise strain
- Carbide end mill cuts polymer and aluminum lowers in under 15 minutes
- Compatible with standard 3mm and 5mm drill bits from any hardware store
Trade-offs
- Requires separate purchase of drill press or milling machine - adds $150-400 to total cost
- No included wrench for T15 fasteners - need personal tools for assembly
- End mill lifespan limited to 15-20 lowers versus 30+ with premium alternatives
- Jig body aluminum susceptible to cosmetic scratching during storage
Expert review
Key attributes
| Compatibility | AR-15 80% lower receivers |
| Weight | 2.8 lb |
| Dimensions | 8.5 x 4.25 x 3.1 in |
| Material | 6061 aluminum frame, hardened steel bushings |
| Drill Size | 3mm and 5mm |
| Accuracy | ±0.002 inch |
| Component Count | 12 pieces |
| Finish | Matte black anodized |
Frequently asked questions
- Is it compatible with Polymer80 PF940v2 frames?
- No, this jig is specifically designed for AR-15 pattern 80% lower receivers, not pistol frames. The RL556v3 works with standard AR-15 lower blanks measuring 1.25 inches wide at the trigger pocket area. For Glock-compatible frames, you need Polymer80's PF series jigs with different bushing spacing.
- Does it fit 80% Arms lower receivers?
- Yes, the RL556v3 jig accommodates 80% Arms lowers with their standard .250 inch thick side walls. The clamping system applies 125 psi of pressure to secure the receiver without deformation during milling operations. Ensure your lower has the standard AR-15 trigger pocket dimension of 1.25 x 0.75 inches before starting.
- How long does shipping take from your Dallas facility?
- Most orders ship within 24 business hours via USPS Priority Mail, arriving in 2-3 days continental US. Our Dallas facility processes 85% of jig kit orders same-day when placed before 2 PM CST. International shipments require 7-10 days with additional customs documentation.
- Can I return it if it doesn't fit my specific lower receiver?
- We accept returns within 30 days if the jig shows no signs of use and all components are present. Used end mills or damaged bushings void the return eligibility due to safety concerns. Contact our support team with your lower receiver specifications before purchasing to confirm compatibility.