Posted by Modulus Arms Product Team on 4th May 2026
Easy Jig Gen 4 Feature Categories
Easy Jig Gen 4 Feature Categories
Modulus Arms has been a leader in 80 lower jig development and router-based tooling since 2014. Easy Jig Gen 4 is the current-generation multi-platform router jig from 80% Arms, sold through Modulus. When you search the name, you want feature categories you can compare against Gen 3 listings and competing multi-platform jigs.
Easy Jig Gen 4 feature categories include universal multi-platform support (AR-15, AR-9, AR-45, DPMS Gen 1 .308), quick platform conversion via rear buffer plate adjustment, published router compatibility lists, reduced-drilling marketing claims, built-in measuring gauges, bearing-supported end mill durability language, and optional starter kit bundling. Verify live SKU inventory at Modulus before purchase.
Gen 4 Product Listings at Modulus
Modulus lists Easy Jig Gen 4 products in /80-lower-jigs:
| SKU | Listing role |
|---|---|
| 80% Arms Easy Jig Gen 4 Multiplatform | Jig fixture listing |
| Easy Jig Gen 4 Starter Kit | Bundled starter configuration |
Inventory status changes on live pages. Treat category presence as the starting point and confirm availability before ordering.
Easy Jig Gen 4 is a third-party router jig family. It uses 80% Arms documentation and Modulus category support—not the Router Jig Extreme SpeedMill ecosystem.
Feature Category 1: Truly Universal Platform Support
Gen 4 product pages describe one jig finishing multiple platform families without additional adapter pieces:
| Platform | Product-page label |
|---|---|
| AR-15 | Rifle-platform baseline |
| AR-9 | Pistol-caliber carbine |
| AR-45 | Large-caliber pistol platform |
DPMS Gen 1 .308 |
Large-frame pattern language |
Platform conversion is marketed as a rear buffer plate adjustment rather than separate adapter SKUs. That is a major Gen 4 buyer feature—breadth without add-on platform kits.
For DPMS Gen 1 terminology depth, see AR-10 vs LR-308 vs DPMS Gen 1 Terms. For multi-platform shopping context, see Multi-Platform Jigs.
Feature Category 2: Router Compatibility Breadth
Gen 4 marketing describes testing with many common handheld routers and compatibility with full-size routers when an adapter is used. This category splits into:
| Sub-category | Buyer meaning |
|---|---|
| Handheld router list | Verify your router model appears on the product page |
| Full-size router support | Adapter requirement—not automatic fit |
| No drill press requirement | Router-first fixture category |
Router compatibility is jig-family specific. See Router Compatibility for 80 Lower Jigs for cross-family concepts, then return to the Gen 4 product page for Easy Jig-specific notes.
Feature Category 3: Fast Setup and Fixture Handling
Product pages group convenience features:
- Built-in measuring gauges (reduced separate measuring tool reliance)
- Quick lower insertion and removal without side wall disassembly
- Reduced drilling marketing vs older fixture generations
- Handheld drill + router workflow (no drill press marketing emphasis)
This guide does not reproduce operational sequences. The buyer takeaway is fixture handling efficiency as a product positioning category.
Feature Category 4: Durability and Wear-Surface Design
Gen 4 durability language includes:
| Component theme | Marketing claim category |
|---|---|
| Bearing-supported end mill | End mill avoids direct jig contact for wear reduction |
| Hardened steel drill guides | Long bushings in sidewalls |
| Extended service life | Wear-surface minimization positioning |
Durability categories matter alongside replacement support. Easy Jig Gen 3 has a dedicated Gen 3 replacement parts category at Modulus. Confirm Gen 4 replacement paths on live pages or through support—do not assume Gen 3 SKUs interchange without verification.
Feature Category 5: Starter Kit vs Jig-Only Purchase
The Gen 4 line splits into fixture-only and starter kit listings:
| Purchase path | Typical buyer question |
|---|---|
| Gen 4 Multiplatform jig | Already owns compatible tooling? |
| Gen 4 Starter Kit | Needs bundled tooling/accessories in one SKU? |
Starter kit naming aligns with broader Modulus terminology explained in 80 Lower Jig Kit vs Tool Kit vs Starter Kit. Read each listing's included-components section before assuming parity with Gen 3 starter kits.
Feature Category 6: Gen 4 vs Gen 3 Comparison Context
Modulus still lists Easy Jig Gen 3 Multi-Platform alongside Gen 4 products. Gen 3 product pages describe similar multi-platform support and router compatibility themes.
| Comparison angle | Buyer note |
|---|---|
| Generation label | Gen 4 is the newer product generation in category listings |
| Platform list | Both describe AR-15, AR-9, AR-45, and .308 language |
| Replacement parts | Gen 3 has a visible Modulus replacement category |
| Purchase timing | Verify which generation matches current inventory and support |
Gen 4 vs Gen 3 is a product generation comparison—not a materials or legal question. Pick the live SKU that matches your tooling and support expectations.
Feature Category 7: Product-Page Disclaimers and Special Features
Gen 4 product pages include feature language about mil-spec M16 fire control group pocket cutting and associated disclaimers. At the buyer literacy level:
- Treat special feature callouts as product capability categories
- Read disclaimer blocks on the live page without interpreting them as legal advice
- Escalate questions to manufacturer support when feature intent is unclear
This article does not analyze regulatory status. It maps feature categories so shoppers know what product-page sections mean.
Support and Verification Checklist
Before purchasing Easy Jig Gen 4:
- Confirm live SKU: Multiplatform vs Starter Kit
- Match your router to the product-page compatibility list
- Verify platform labels against your blank type
- Check replacement-parts availability for your generation
- Compare against Router Jig Pro if cross-shopping multi-platform jigs
FAQ
What is Easy Jig Gen 4?
Easy Jig Gen 4 is 80% Arms' current-generation multi-platform router jig, sold through Modulus, marketed for AR-15, AR-9, AR-45, and DPMS Gen 1 .308 platform support.
What is the difference between Gen 4 Multiplatform and Gen 4 Starter Kit?
Multiplatform is the jig fixture listing. Starter Kit is a bundled configuration—verify included components on each live product page.
Does Easy Jig Gen 4 use SpeedMill?
No. SpeedMill belongs to the Router Jig Extreme ecosystem. Easy Jig uses its own tooling documentation on 80% Arms product pages.
How does Gen 4 compare to Gen 3?
Both are multi-platform Easy Jig generations with overlapping platform marketing. Gen 4 is the newer listing generation. Verify live inventory and replacement support before choosing.
Where do Easy Jig replacement parts live?
Gen 3 has Gen 3 replacement parts at Modulus. Confirm Gen 4 replacement paths on live pages or through support.
Related Resources
- 80% Arms Easy Jig Gen 4 Multiplatform
- Easy Jig Gen 4 Starter Kit
- 80 Lower Jigs
- Router Jig Pro vs Easy Jig Comparison
- Multi-Platform Jig vs Platform-Specific Jig
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