Easy Jig® Gen 3 Multi-Platform – AR-15, AR-9 and .308 80% Lower Jig
Pros & cons
What works
- Eliminates adapter requirements—handles 4 platforms with one 4.2 lb jig body
- Completes lowers in 90 minutes—50% faster than Gen 1 jigs with adapter changes
- Patented Trident pins prevent misalignment—maintains 0.001" tolerance across 12 alignment points
- Lifetime warranty—covers aluminum components against manufacturing defects indefinitely
Trade-offs
- Requires $150+ router investment—23 compatible models but none included
- No thread locker included—vibration can loosen hardware during extended use
- Generates aluminum chips—requires workshop cleanup versus drill press filings
- Limited to mil-spec lowers—won't fit proprietary designs like Radian or Seekins
Video review
Expert review
Specs at a glance
About this product
What is the Easy Jig® Gen 3 Multi-Platform? It's a universal router jig system designed for machining AR-15, AR-9, and .308 80% lower receivers to completion without requiring specialized adapters or advanced gunsmithing skills. Developed by 80% Arms, this third-generation jig incorporates patented alignment features that eliminate common setup errors while maintaining compatibility with over 23 different router models. Unlike previous jig systems that required platform-specific components, the Gen 3 uses a single jig body with quick-adjust features that switch between platforms in under 30 seconds.
What is the Easy Jig® Gen 3 Multi-Platform used for?
The Easy Jig® Gen 3 Multi-Platform is used for completing 80% lower receivers into functional firearm components using a standard handheld router. This jig guides the milling process for the fire control group pocket, trigger pin holes, and safety selector cavity with military-grade precision. It handles both forged and billet aluminum lowers across four platforms (AR-15, AR-9, AR-45, and DPMS Gen 1 .308) without additional adapters, completing a lower in approximately 90 minutes with proper technique.
How does the Easy Jig® Gen 3 Multi-Platform compare to the 80% .308 Easy Jig® Gen 1?
The Gen 3 Multi-Platform outperforms the Gen 1 .308-specific jig in versatility and setup speed while maintaining identical machining precision. Where the Gen 1 requires complete disassembly and adapter changes to switch between caliber platforms, the Gen 3 uses quick-adjust rear supports and patented Trident front pins that eliminate alignment issues common in earlier designs. The Gen 3 completes multiple platform types with one jig body versus the Gen 1's single-platform limitation, though both produce equally precise fire control group pockets when properly set up.
What does it weigh and what are the dimensions?
The complete Easy Jig® Gen 3 Multi-Platform system weighs 4.2 pounds (1.9 kg) and measures 9.5 x 6.25 x 3.75 inches in its assembled state. This weight includes the aluminum jig body, all platform-specific components, and the necessary hardware for operation. The compact dimensions allow it to fit in most bench vise setups while providing sufficient mass to dampen router vibration during the milling process.
Who is this NOT for?
This jig is not for builders seeking a drill press solution or those working with non-mil-spec lower receivers. The system requires a handheld router (compatible with 23+ models) and generates aluminum chips rather than filings, which demands proper workshop containment. Beginners should review our installation guide before attempting their first build, as improper router technique can damage both the jig and lower receiver.
What's in the box?
The box contains the Gen 3 jig body, quick-adjust rear support blocks for all four platforms, Trident front pin sets, router base plate, 5/16" end mill, drill bits, and all necessary hardware. Specifically, you receive 12 precision-ground alignment pins, 3 platform-specific rear blocks, and the recommended 5/16″ High Speed End Mill that's essential for proper material removal. The package lacks thread-locking compound, which I recommend adding for permanent installations.
Is the Easy Jig® Gen 3 Multi-Platform worth it at $349?
At $349, the Gen 3 Multi-Platform justifies its cost for builders planning multiple platform builds or professional shops serving clients with diverse caliber needs. Compared to purchasing separate jigs for AR-15 ($199) and .308 platforms ($249), the multi-platform capability represents a $100 savings while reducing storage requirements. For single-platform builders, the platform-specific compared here: 308 80% Lower – Billet with a dedicated jig might prove more cost-effective despite the Gen 3's superior engineering.
Key attributes
| Platforms | AR-15, AR-9, AR-45, DPMS Gen 1 .308 |
| Weight | 4.2 lb |
| Dimensions | 9.5 x 6.25 x 3.75 in |
| Completion Time | 90 minutes |
| Router Compatibility | 23+ models |
| Warranty | Lifetime |
| Material | 6061-T6 aluminum |
| Lower Compatibility | Forged or billet mil-spec |
Specifications
| Platforms | AR-15, AR-9, AR-45, DPMS Gen 1 .308 |
| Front Pin System | Patented Trident pins |
| Rear Support | Quick-adjust |
| Completion Time | Under 90 minutes |
| Compatibility | 23+ routers |
| Warranty | Lifetime |
| Legal Status | 100% legal for personal use |
| Shipping | Direct (no FFL required) |
| Age Requirement | 21+ |
| Lower Types | Forged or billet mil-spec |
Best for
- 80% lower finishing
- AR platform builds
- Personal firearm customization
Frequently asked questions
- Is it compatible with Milwaukee M18 Fuel routers?
- Yes, the Easy Jig® Gen 3 is compatible with Milwaukee M18 Fuel routers (model 2626-20) and 22 other router models. The base plate accepts routers with 2-3/8" to 2-1/2" base diameters, and the included hardware accommodates most collet sizes. Confirm your specific model against the 23+ compatible routers listed in the manual.
- Does it fit Anderson Manufacturing lowers?
- The jig fits all mil-spec forged Anderson Manufacturing lowers perfectly, as they adhere to standard AR-15 dimensions. For billet lowers, verify the exterior dimensions match mil-spec patterns—most Anderson billets work, but some custom profiles may require slight modification. The Trident pin system compensates for minor forging variations up to 0.005" tolerance.
- How long does shipping take?
- Shipping typically takes 3-5 business days via USPS Priority Mail for continental US orders. Polymer80USA.com processes orders within 24 hours on business days, and the jig ships direct with no FFL requirement. International shipments to compliant countries require 10-14 days and additional customs documentation.
- Can I return it if I damage my lower during milling?
- No, returns aren't accepted for user-error damage to lowers or the jig itself—the lifetime warranty covers manufacturing defects only. The jig produces perfect results with proper technique, but I recommend practicing on inexpensive [80% Lower Fire/Safe Marked](/products/80-lower-fire-safe-marked-anodized-black/) receivers first. Review the manual and our [alignment guide](/blog/80-lower-receiver-jig-alignment-pin-specifications/) before your first attempt.
- Does this work with Polymer80 AR-9 lowers?
- Yes, the Gen 3 jig works perfectly with Polymer80 AR-9 lowers, which use standard mil-spec exterior dimensions. The quick-adjust rear support switches to AR-9 configuration in about 15 seconds, and the Trident pins align precisely with the front takedown pin holes. No additional adapters are needed beyond the included platform components.