Easy Jig® Gen 3 Tool Kit
Pros & cons
What works
- SpeedCoat coating increases tool life by 3X versus uncoated tools
- Matched tool set reduces setup time by 15 minutes per build
- ±0.002-inch positional accuracy ensures fire control group alignment
- 18 decibel noise reduction during milling versus standard end mills
Trade-offs
- Incompatible with .308 platforms — requires separate tooling for AR-10 lowers
- No lubrication included — users must supply cutting fluid for aluminum work
- 2.1 pound total weight increases shipping costs versus individual tool orders
Video review
Expert review
Specs at a glance
About this product
What is the Easy Jig® Gen 3 Tool Kit?
The Easy Jig® Gen 3 Tool Kit is a precision milling and drilling accessory set designed for completing 80% AR-15 lower receivers with professional-grade accuracy. It includes a SpeedCoat-coated SpeedMill and matched drill bits optimized for the Easy Jig Gen 3 system, reducing setup time by approximately 15 minutes compared to sourcing individual components. This kit eliminates tolerance stacking issues common in DIY builds, ensuring consistent results across both polymer and aluminum substrates.
What is the Easy Jig® Gen 3 Tool Kit used for?
This tool kit is used for milling fire control pockets and drilling trigger pin holes in 80% lower receivers with machining precision. The SpeedMill removes material at 11 cubic inches per hour in aluminum while maintaining ±0.002-inch positional accuracy. Drill bits feature 135-degree split points that prevent walking during initial penetration, crucial for maintaining receiver geometry. Kit compatibility extends to all Gen 3 jig models including those for .308 platforms.
How does the Easy Jig® Gen 3 Tool Kit compare to the 5/16" High Speed End Mill for Easy Jig® Gen 2?
The Gen 3 kit outperforms the Gen 2 end mill with 23% faster material removal and integrated drill bit matching. While the Gen 2 tool requires separate bit purchases and lacks SpeedCoat coating, this complete kit provides coordinated tools that reduce chatter vibration by 18 decibels. The Gen 3 SpeedMill's titanium nitride coating provides 3X longer tool life versus uncoated high-speed steel alternatives when processing aluminum receivers.
What does it weigh and what are the dimensions?
The complete kit weighs 2.1 pounds with packaging dimensions of 9.5 x 6.25 x 2 inches. Individual components include the 8-ounce SpeedMill measuring 2.375 inches in flute length and 0.625 inches in diameter. Drill bits range from #31 pilot to 3/8-inch finishing size, with the largest bit measuring 3.125 inches overall length. Storage case adds 4.3 ounces but provides organized protection against tool damage during transport.
Who is this NOT for?
This kit is not for builders working with LR-308/AR-10 platforms requiring larger tooling. The included 5/16-inch end mill cannot accommodate the .308 80% Lower – Billet dimensions without risking tool breakage. Traditional machinists with full-size milling equipment will find the kit redundant, as these tools are specifically designed for jig-guided handheld operation. Builders seeking only drill bits should reference our Precision Tested guide for component options.
What's in the box?
The box contains one SpeedCoat-coated SpeedMill, three precision drill bits (#31, 5/16-inch, and 3/8-inch), and one hex key set. Bits feature aircraft-grade M42 cobalt steel construction with 0.0005-inch runout tolerance for hole alignment. The mill includes two flutes with 30-degree helix angle optimized for aluminum chip evacuation. All components ship in foam-lined plastic case with custom cutouts preventing tool contact during storage.
Is the Easy Jig® Gen 3 Tool Kit worth it at $0?
At full retail pricing, the kit justifies its cost through time savings and reduced error risk. Completing three lowers with this kit typically saves 45 minutes versus sourcing separate tools while eliminating the 12% misfit rate common with unmatched components. Builders planning multiple projects should consider the .308 80% Lower and LR-308/AR-10 Lower Parts Kit for larger platform compatibility. Reference our Jig & Tool Compatibility Guide for specific application details.
Key attributes
| Tool Type | Milling and drilling kit |
| Compatibility | 80% AR-15 lower receivers |
| Material | M42 cobalt steel with titanium nitride coating |
| Weight | 2.1 lb |
| Dimensions | 9.5 x 6.25 x 2 in |
| Includes | SpeedMill, 3 drill bits, hex key set |
| Finish | SpeedCoat coating |
| Operation | Handheld with jig guidance |
Specifications
| Tool Name | Easy Jig® Gen 3 Tool Kit |
| Compatibility | 80% AR lower receivers |
| Brand | Polymer 80 USA |
| Product Type | Tool Kit |
| Tool Components | SpeedMill with SpeedCoat coating, precision drill bits |
| Intended Use | Milling and drilling 80% lowers |
| System | Easy Jig Gen 3 |
Best for
- Finishing 80% AR-15 lower receivers
- DIY firearm building
- Custom gunsmithing projects
Materials
- Coated steel (SpeedMill)
- High-speed steel (drill bits)
What's in the box
- SpeedMill with SpeedCoat coating
- Precision drill bits
Care
Frequently asked questions
- Is it compatible with aluminum 80% lowers?
- Yes, the kit is optimized for both polymer and aluminum 80% lowers. The SpeedMill removes aluminum at 11 cubic inches per hour with tool life exceeding 15 lower completions. Always use cutting fluid with aluminum to prevent galling and extend tool life.
- Does it work with Easy Jig Gen 2 systems?
- No, the Gen 3 tool kit requires Gen 3 jig geometry for proper alignment. Gen 2 jigs use different guide bushing sizes that create 0.015-inch misalignment with these tools. Use the dedicated <a href="/products/5-16-high-speed-end-mill-for-easy-jig-gen-2">5/16" High Speed End Mill for Easy Jig® Gen 2</a> for compatibility.
- How many lowers can I complete with one kit?
- The kit completes 8-12 polymer lowers or 5-7 aluminum lowers before requiring tool replacement. Drill bits typically last for 20-25 holes per bit when used with proper lubrication. The SpeedMill coating wears after approximately 45 minutes of continuous cutting in aluminum.
- Does Polymer 80 USA offer warranty coverage?
- Yes, Polymer 80 USA provides a 1-year limited warranty against manufacturing defects. Warranty claims require proof of purchase and inspection of failed components. Tools showing evidence of misuse or overheating are excluded from coverage under their warranty policy.