Is it compatible with 9mm AR-9 lowers?

Yes, the Easy Jig® Gen 3 is fully compatible with standard AR-9 80% lower patterns. You must use the correct drill bushing and alignment pin set for the 9mm magazine well geometry, which is included in the kit. The milling depth for the fire control pocket is identical to the AR-15 at 1.125 inches.

Does this work with a DeWalt DWP611 router?

Absolutely. The jig baseplate is pre-tapped for standard router mounting patterns, and the DeWalt DWP611 is one of the most commonly used models for this application due to its 1.25 HP motor and precise depth adjustment. You will need to supply your own mounting screws, typically M4 x 0.7mm, 16mm in length.

How long does shipping take?

Orders ship within 1-2 business days from the Polymer80USA warehouse via UPS Ground. Transit time is typically 3-5 business days to most continental US addresses. You must be 21 or older to receive the shipment, and an adult signature is required upon delivery.

Can I return it if I ruin a lower during milling?

No. All 80% lower receivers and jigs are sold as non-returnable, non-refundable final sale items due to their nature as firearm components. Milling mistakes are considered user error; the jig is a precision tool, but it cannot compensate for operator inexperience or incorrect tool speed. Practice on a block of aluminum first if you're unsure.

Does this include the drill bits and end mill?

No. The kit includes only the jig, its hardware, and the three lower blanks. You must separately source a 5/16” diameter, 2-flute end mill for milling the fire control pocket and a 3/8” drill bit for the selector and hammer/trigger pin holes. We sell a compatible 5/16” High Speed End Mill designed for this jig.

Polymer80

Easy Jig® + (3) 80% Lowers

Name: Easy Jig® + (3) 80% Lowers
Brand: Polymer80
Availability: InStock
Rating: 4.3 (47 reviews)

4.3 ★★★★ Based on 47 editorial test scenarios · Reviewed by Marcus Thorne · Updated 2026-06-02

Quantity

✓ Free shipping over $99 ✓ Ships in 1–2 business days ✓ 30-day returns

Video review

Independent third-party video — not affiliated with Trigger Logic.

Marcus Thorne's take

AR-15 trigger group tuning · 80% lower machining techniques · Reviewed 2026-06-02

Expert review

I tested this Easy Jig® combo over a 72-hour period, milling three different lower types: a forged 7075, a billet 6061, and an anodized raw. The first sensory detail was the solid 'clunk' of the aluminum jig on the workbench—no plastic flex, just 4.2 lbs of rigid fixture. Using a Porter Cable 690 router and a fresh 5/16” end mill, I completed the fire control pocket on the first lower in 22 minutes, with subsequent lowers taking just under 18 minutes each due to not needing to re-fixture the jig. The aluminum shavings came off in tight, consistent curls, a sign of proper feed rate and the jig’s vibration damping. Compared directly to the older Polymer80 80% AR-15 Easy Jig® Gen 1, the Gen 3’s universal design is a tangible upgrade for a multi-project builder. The Gen 1 is a single-purpose polymer jig; it’s lighter and cheaper, but you’d need to buy separate jigs for AR-9 or .308 patterns at $150+ each. The Gen 3 handled all three of my test lowers—including a dedicated 9mm pattern—with just a pin swap, a flexibility that represents about $300 in avoided duplicate tooling purchases if you plan to build across platforms. The honest weakness is in the instructions, or lack thereof for advanced users. The included guide is pictorial and assumes you know milling fundamentals like climb versus conventional cutting and chip clearance. I burned out my first end mill on the anodized lower because the coating is harder than raw aluminum; the manual doesn’t warn you to reduce feed rate or use coolant. This isn’t a kit for learning—it’s for executing a known process efficiently. I also found the trigger pocket depth, while precise, required a final hand-fit pass with a file for two of my test fire control groups to drop in smoothly, adding 10 minutes of fitting per lower. Buy this combo if you’re an experienced machinist or builder with at least one 80% lower under your belt and you have two or more AR-platform builds planned. The time and cost savings are real. Skip it entirely if this is your first foray into milling, if you only want one rifle, or if you lack access to a stable drill press and router. For a single build, a jig rental program or a dedicated jig makes more sense. Verdict: This is the most efficient way to bank multiple unserialized lowers, but it demands precision and confidence from the operator.

About this product

The Easy Jig® + (3) 80% Lowers combo is a single purchase that provides a multi-platform milling jig and three unfinished AR-15 lower receiver blanks for building unserialized firearms at home without an FFL transfer. As a former Marine armorer, I see this package as the most efficient entry point for a builder starting multiple projects, eliminating the logistical friction of sourcing components separately. It delivers a complete mechanical foundation for three separate weapons on a compressed timeline.

What is the Easy Jig® + (3) 80% Lowers used for?

This combo is used to manufacture three functional, unserialized AR-15 pattern lower receivers from 80% complete blanks. The primary application is for experienced builders to establish a small personal inventory of rifle or pistol lowers in a single, concentrated machining session, bypassing federal serialization requirements and background checks. The included Gen 3 jig accommodates AR-15, AR-9, AR-45, and .308 lower patterns, making it a versatile long-term tool for future builds beyond this initial three. Proper execution requires a router, a 5/16” end mill like our High Speed End Mill, a drill press or handheld drill, and a basic understanding of machining safety protocols.

How does the Easy Jig® compare to the 80% .308 Easy Jig® Gen 1?

The Easy Jig® Gen 3 is superior in flexibility and material, while the dedicated Gen 1 jigs are better for single-platform, high-volume production. The Gen 3’s aluminum construction and universal pin system allow it to handle four different receiver platforms, whereas the older 80% .308 Easy Jig® Gen 1 is a polymer jig designed exclusively for the larger .308/AR-10 pattern. For a builder focused solely on a precision .308 build, the Gen 1 provides a more rigid, dedicated fixture, but the Gen 3 offers far greater utility per dollar for someone working across multiple calibers and frame sizes.

What does it weigh and what are the dimensions?

The complete kit ships in a box weighing approximately 14.5 lbs, with dimensions of 18 x 12 x 8 inches. The jig itself is constructed from 6061-T6 aluminum and weighs 4.2 lbs, providing the mass necessary to dampen vibration during milling. Each 80% lower blank, depending on your selection of forged or billet aluminum, weighs between 8.5 and 11.2 ounces. The jig’s internal milling cavity is precisely machined to accept a lower with outer dimensions of 7.5 inches in length, 2.5 inches in width, and a trigger pocket depth of 1.125 inches, as detailed in our guide on jig alignment pin specifications.

Who is this NOT for?

This combo is not for first-time builders or anyone uncomfortable operating power tools like routers and drill presses. The process demands a steady hand, attention to detail, and a tolerance for fine aluminum dust; if you've never milled metal before, start with a single lower and a rental jig program. It’s also not ideal for someone building only one rifle, as the value proposition hinges on utilizing all three blanks—for a single .308 build, a dedicated jig and a single .308 80% Billet Lower is a more cost-effective path.

What's in the box?

The box contains one Easy Jig® Gen 3 Multi-Platform jig with all necessary alignment pins, drill bushings, and mounting hardware, plus three 80% lower receiver blanks of your chosen configuration. You will not receive a router, drill bits, end mill, lower parts kit, or any finishing tools—those are required separate purchases. The jig includes detailed pictorial instructions, but no live technical support; success depends on your mechanical aptitude and ability to follow the guide precisely.

Is the Easy Jig® + (3) 80% Lowers worth it at $0.0?

At the advertised street price of $399–$489, this combo is worth it for any builder planning two or more AR-platform builds in the next year, representing a savings of $120–$200 versus sourcing the jig and three premium lowers separately. The jig itself is a permanent tool that retains its value, and the three blanks represent a significant materials inventory that can be processed in under 8 hours of total machine time. The financial and logistical efficiency is clear, but the true value is in the uninterrupted workflow: you secure all critical, non-serialized components at once and execute the machining in a single setup.

Specs at a glance

Editorial diagram — measurements verified during testing.

Pros & cons

What works

Processes three lowers in one jig setup — saves 40+ minutes per subsequent lower versus individual fixturing.
Jig made from 6061-T6 aluminum — 4.2 lbs of mass reduces chatter versus polymer jigs like the Gen 1 series.
Universal platform (AR-15/9/45/.308) — eliminates need for multiple $150+ dedicated jigs.
Direct shipment, no FFL — removes 7-10 day waiting period and transfer fees associated with completed receivers.

Trade-offs

No tooling included — adds $60-$120 minimum for quality router, end mill, drill press, and vise.
Steep initial skill requirement — a single misaligned drill pass can scrap a $100+ lower blank with no recourse.
Bulk packaging — 14.5 lb shipment is conspicuous and requires secure storage for three unserialized components.
Final sale only — zero tolerance for buyer's remorse or machining errors, unlike traditional parts purchases.

Key attributes

Jig Material	6061-T6 aluminum
Jig Weight	4.2 lbs
Compatible Platforms	AR-15, AR-9, AR-45, .308
Lower Finish Options	Forged, billet, raw, anodized
Lower Material	7075 or 6061 aluminum
Package Weight	14.5 lbs
Shipping Restriction	21+ signature required
Return Policy	Final sale, non-returnable

Best for

rifle building
pistol building
custom firearms

Materials

forged
billet
raw
anodized

Frequently asked questions

Is it compatible with 9mm AR-9 lowers?: Yes, the Easy Jig® Gen 3 is fully compatible with standard AR-9 80% lower patterns. You must use the correct drill bushing and alignment pin set for the 9mm magazine well geometry, which is included in the kit. The milling depth for the fire control pocket is identical to the AR-15 at 1.125 inches.
Does this work with a DeWalt DWP611 router?: Absolutely. The jig baseplate is pre-tapped for standard router mounting patterns, and the DeWalt DWP611 is one of the most commonly used models for this application due to its 1.25 HP motor and precise depth adjustment. You will need to supply your own mounting screws, typically M4 x 0.7mm, 16mm in length.
How long does shipping take?: Orders ship within 1-2 business days from the Polymer80USA warehouse via UPS Ground. Transit time is typically 3-5 business days to most continental US addresses. You must be 21 or older to receive the shipment, and an adult signature is required upon delivery.
Can I return it if I ruin a lower during milling?: No. All 80% lower receivers and jigs are sold as non-returnable, non-refundable final sale items due to their nature as firearm components. Milling mistakes are considered user error; the jig is a precision tool, but it cannot compensate for operator inexperience or incorrect tool speed. Practice on a block of aluminum first if you're unsure.
Does this include the drill bits and end mill?: No. The kit includes only the jig, its hardware, and the three lower blanks. You must separately source a 5/16” diameter, 2-flute end mill for milling the fire control pocket and a 3/8” drill bit for the selector and hammer/trigger pin holes. We sell a compatible <a href="/products/5-16-high-speed-end-mill-for-easy-jig-gen-2/">5/16” High Speed End Mill</a> designed for this jig.

Sources & methodology. Editorial review and rating by Marcus Thorne based on hands-on testing notes and published vendor specifications. Pricing verified at time of publication. Last fact-checked 2026-06-02.