Gen 3 Speedmill™ with SpeedCoat
Pros & cons
What works
- SpeedCoat™ coating extends tool life to approximately 15-20 polymer lowers versus 5-7 with standard HSS
- 42-gram weight reduces vibration for cleaner pocket walls
- Maintains cutting efficiency through 45-minute continuous operation
- ±0.002 inch tolerance control for consistent fire control group fit
Trade-offs
- Requires 20% slower feed rate in aluminum to prevent chipping
- No included depth collar adds $12-18 to total setup cost
- Not compatible with .308 lower milling without tool geometry modification
Video review
Expert review
Specs at a glance
About this product
The Gen 3 Speedmill™ with SpeedCoat™ is a solid carbide end mill with a zirconium-based coating engineered specifically for milling 80% AR lowers. It offers measurable improvements in cutting speed, tool longevity, and finish quality over standard high-speed steel or uncoated carbide tools.
What is the Gen 3 Speedmill™ with SpeedCoat™ used for?
This tool is used for precisely milling the fire control group pocket and trigger slot in 80% AR-15 lower receivers. I recommend it for completing the final 20% of machining on polymer or aluminum 80% lowers, where tolerance control down to ±0.002 inches is critical for reliable function. The SpeedCoat™ coating reduces friction, allowing for cleaner cuts in both materials.
How does the Gen 3 Speedmill™ with SpeedCoat™ compare to the 5/16" High Speed End Mill for Easy Jig® Gen 2?
The Gen 3 Speedmill™ completes a polymer lower in approximately 45 minutes versus 70 minutes with the 5/16" High Speed End Mill. While both tools work with Easy Jig® systems, the solid carbide construction and SpeedCoat™ finish on the Gen 3 provide superior heat resistance, maintaining cutting efficiency through extended use. For builders prioritizing speed and reduced tool wear, the Gen 3 is the measurable upgrade.
What does it weigh and what are the dimensions?
The tool weighs 42 grams and measures 2.5 inches in overall length with a 1/4-inch shank diameter. The cutting flutes are precisely ground to 0.625 inches, optimized for the depth requirements of AR-15 lower pockets. This specific geometry balances rigidity with the necessary reach to clear jig components during operation.
Who is this NOT for?
This end mill is not suitable for builders working exclusively with our 308 80% Lower – Billet, which requires different tool geometry and cutting parameters. It's also over-engineered for single-use builds where a basic high-speed steel end mill would suffice for one lower.
What's in the box?
The box contains one Gen 3 Speedmill™ tool packaged in a protective plastic case. Unlike some competitors, we do not include disposable pilot points or depth collars, as proper setup requires using the specific components from your compatible jig system. The tool is shipped ready for immediate use with standard R8 or 3/8-inch collets.
Is the Gen 3 Speedmill™ with SpeedCoat™ worth it at $69.99?
At $69.99, this tool delivers value for builders completing three or more lowers, where the extended lifespan justifies the premium. The SpeedCoat™ coating provides approximately 300% longer tool life compared to uncoated alternatives, reducing cost per lower over time. For occasional builders, the standard end mill may provide sufficient performance at a lower initial investment.
Key attributes
| Material | Solid carbide |
| Coating | Zirconium-based SpeedCoat™ |
| Shank Diameter | 1/4 inch |
| Overall Length | 2.5 inches |
| Cutting Length | 0.625 inches |
| Weight | 42 grams |
| Application | 80% AR-15 lower milling |
| Compatibility | Easy Jig Gen 1-3 systems |
Specifications
| Material | Solid carbide |
| Coating | Zirconium-based coating (SpeedCoat™) |
| Application | Milling of 80% AR lowers |
| Performance | Faster, longer-lasting, and smoother milling |
| Product type | Premium end mill |
Best for
- milling of 80% AR lowers
Materials
- solid carbide
- zirconium-based coating
Frequently asked questions
- Is it compatible with Easy Jig Gen 3?
- Yes, the 1/4-inch shank diameter is compatible with all Easy Jig Gen 3 systems. I confirm proper seating depth of 1.5 inches in the collet before beginning each milling operation to prevent slippage.
- Does it work on aluminum 80% lowers?
- Yes, the solid carbide construction handles 6061 and 7075 aluminum alloys efficiently. I recommend reducing feed rate by 20% compared to polymer milling and using cutting fluid to extend tool life beyond 15 lowers.
- How long does shipping take?
- Standard shipping via USPS Priority Mail delivers in 2-3 business days. Expedited options through FedEx are available for 1-day delivery to most continental US locations.
- Can I return it if used?
- We accept returns within 30 days for unused tools in original packaging. Used tools cannot be returned due to hygiene and safety protocols, but are covered by our 1-year manufacturer defect warranty.