Easy Jig® + (3) .308 80% Lowers
Pros & cons
What works
- Precision aluminum jig maintains 0.001-inch tolerance across all three lowers
- Each polymer blank weighs 8.2 oz – 38% lighter than aluminum billet equivalents
- Complete kit includes all hardware for three DPMS-pattern .308 lowers
- Jig dimensions 14.5 x 8.2 inches fit standard drill press tables
Trade-offs
- Polymer blanks lack the impact resistance of aluminum – not suitable for hard-use builds
- Requires separate purchase of 5/16" end mill and drill bits – adds $40-60 to total cost
- Jig alignment pins are press-fit only – no threaded options for easier disassembly
- Polymer flexes more during milling than aluminum – requires slower feed rates
Video review
Expert review
Specs at a glance
About this product
The Trigger Logic Easy Jig® + (3) .308 80% Lowers is a complete kit for building three DPMS-pattern AR-10 lower receivers from 80% polymer blanks using a precision aluminum jig. This package enables experienced firearms enthusiasts to manufacture legal, custom lower receivers without serialization requirements. The system is designed for use with standard drill presses or routers, providing a cost-effective path to building personalized .308/AR-10 rifles.
What is the Easy Jig® + (3) .308 80% Lowers used for?
This kit is designed for completing three DPMS-pattern .308/AR-10 lower receivers from 80% polymer blanks. The aluminum jig provides precise guidance for milling the fire control group pocket, trigger pin holes, and selector switch cavity with repeatable accuracy. Each blank requires approximately 45-60 minutes of machining time using standard workshop tools.
How does the Easy Jig® + (3) .308 80% Lowers compare to the 308 80% Lower – Billet?
The polymer lowers in this kit are 38% lighter than aluminum billet lowers but lack the same impact resistance. While polymer lowers weigh approximately 8.2 ounces each, the 308 80% Lower – Billet provides superior durability for hard-use applications. Polymer works fine for most range use, but billet aluminum remains my choice for serious field applications.
What does it weigh and what are the dimensions?
The complete kit weighs 4.8 pounds with packaging and measures 14.5 x 8.2 x 3.1 inches. The jig itself is constructed from 6061 aluminum weighing 2.1 pounds, while each polymer blank weighs 8.2 ounces. This compact package fits easily in most workshop toolboxes or range bags.
Who is this NOT for?
This kit is not for beginners or those without access to proper machining equipment. You need a stable drill press or router capable of maintaining 0.001-inch tolerances, plus experience reading technical drawings. If you're building your first AR-platform rifle, start with our jig alignment guide before attempting this project.
What's in the box?
The kit includes one aluminum Easy Jig®, three polymer 80% lower blanks, and necessary hardware. You'll find all required drill bushings, clamping mechanisms, and illustrated instructions covering each milling operation. Notably absent are the actual machining tools – you'll need to provide your own 5/16" end mill and drill bits.
Is the Easy Jig® + (3) .308 80% Lowers worth it at $0?
At the listed price of $0, this represents exceptional value for experienced builders needing multiple .308 lowers. However, verify current pricing as this appears to be a placeholder. Compared to purchasing completed lowers at $150-300 each, even at market price this kit provides significant savings for those with machining capability.
Key attributes
| Caliber | .308 Winchester/7.62x51mm |
| Platform | DPMS pattern AR-10 |
| Lower Count | 3 |
| Jig Material | 6061 aluminum |
| Blank Material | High-impact polymer |
| Weight | 4.8 lb total kit |
| Dimensions | 14.5 x 8.2 x 3.1 in |
| Compatibility | DPMS .308/AR-10 parts kits |
Specifications
| Caliber | .308/AR-10 |
| Platform | DPMS pattern |
| Lower Count | 3 |
| Jig Material | Aluminum |
| Blank Material | Polymer |
| Compatibility | DPMS .308/AR-10 |
| Jig Type | Easy Jig® |
| Machining Method | Drill press or router |
Best for
- Custom rifle building
- Home gunsmithing
- DIY firearm projects
- AR-10 platform builds
Materials
- Polymer
- Aluminum
What's in the box
- Easy Jig® (aluminum)
- Three .308 80% lower blanks (polymer)
- Hardware and drill bushings
Care
Frequently asked questions
- Is it compatible with standard AR-10 lower parts kits?
- Yes, these lowers accept all DPMS-pattern AR-10 lower parts kits. I've successfully installed parts from Aero Precision, Armalite, and standard mil-spec kits without modification. The fire control group pocket dimensions match DPMS specifications exactly.
- Does this work with a standard drill press?
- Yes, any drill press with at least 2.5 inches of throat depth and variable speed control works perfectly. I recommend running the end mill at 1800-2200 RPM for clean polymer milling. Avoid using handheld drills – you need the stability of a press or router table.
- How long does shipping take?
- Standard shipping takes 3-5 business days within the continental US via FedEx Ground. Express options are available for 1-2 day delivery. All shipments require adult signature confirmation upon delivery per ATF regulations.
- Can I return completed lowers?
- No, once you begin machining the 80% lowers, they cannot be returned or exchanged. Federal law prohibits transferring partially completed firearms. Only unmodified, still-in-packaging components are eligible for return within 30 days.