Easy Jig® + (1) .308 80% Lower
About this product
The Easy Jig® + (1) .308 80% Lower is a complete kit that allows builders to finish their own DPMS-pattern .308 lower receiver with machining-grade precision. This system combines a polymer 80% lower blank with the proven Easy Jig® platform, enabling precise AR-10 builds without requiring an FFL transfer. The jig provides 0.002-inch clearance for router bit guidance, ensuring consistent results for both novice and experienced builders.
What is the Easy Jig® + (1) .308 80% Lower used for?
This kit is specifically designed for finishing 80% lower receivers to create functional DPMS-pattern AR-10 rifles. The Easy Jig® system guides your router or drill press to mill the fire control group pocket with 0.005-inch repeatability across multiple uses. It eliminates the need for complex measurements while maintaining proper sear engagement surfaces.
How does the Easy Jig® + (1) .308 80% Lower compare to the 80% .308 Easy Jig® Gen 1?
The current Easy Jig® system provides superior bit guidance compared to the older Gen 1 model, with 30% tighter bushing tolerances that reduce chatter during milling. While the Gen 1 requires manual depth adjustments for each pass, this updated jig features integrated depth stops that save approximately 15 minutes per build. For builders needing absolute precision, our 308 80% Lower – Billet offers aluminum construction but requires more advanced tooling.
What does it weigh and what are the dimensions?
The complete kit weighs 3.2 pounds with the polymer lower measuring 9.5 inches in length and 2.1 inches in width. The jig itself maintains rigid 0.75-inch thick aluminum side plates that prevent flex during operation, while the polymer blank contributes only 8.3 ounces to the total weight.
Who is this NOT for?
This system is not suitable for builders seeking aluminum lowers or those requiring immediate functionality without machining. The polymer construction has a 15,000-round service life compared to aluminum's near-indefinite durability, making it inappropriate for high-volume shooters. Beginners should review our rail depth measurement protocol before proceeding.
What's in the box?
The kit contains one polymer 80% lower receiver, one Easy Jig® specifically sized for DPMS .308 patterns, and all necessary mounting hardware for secure operation. You'll receive 4 precision-ground alignment pins and 8 clamping screws that maintain consistent pressure distribution during the 45-minute average milling process.
Is the Easy Jig® + (1) .308 80% Lower worth it at $619.96?
At this price point, the kit delivers measurable value for builders completing multiple AR-10 projects, as the jig can be reused for subsequent lowers. The combined cost represents a 40% savings compared to purchasing a finished lower with transfer fees, though builders needing only one rifle might prefer our complete parts bundle.
Specs at a glance
Video review
Pros & cons
What works
- 0.002-inch bushing clearance provides router guidance with minimal deflection
- Polymer blank weighs 8.3 oz — 62% lighter than aluminum billet equivalents
- Jig maintains dimensional stability across 15+ lower completions
- Complete setup requires only 45 minutes from unboxing to first chips
Trade-offs
- Polymer construction limited to 15,000-round service life versus aluminum's indefinite durability
- Requires separate purchase of router and end mill adding $150-300 to total cost
- DPMS Gen 1 pattern only — incompatible with newer Gen 2 uppers without modification
Expert review
Key attributes
| Caliber | .308 Winchester |
| Compatibility | DPMS Gen 1 pattern |
| Blank Material | Polymer |
| Jig Material | 6061 aluminum |
| Weight | 3.2 lb |
| Length | 9.5 inches |
| Width | 2.1 inches |
| Finish | Unfinished polymer |
Specifications
| compatibility | DPMS .308 lower |
| firearm_type | AR-10 builds |
| milling_tool | Drill press or router |
| jig_type | Easy Jig® |
| blank_type | 80% lower |
Best for
- custom AR-10 builds
- finishing 80% lowers
Materials
- polymer
- precision jig
Frequently asked questions
- Is it compatible with DPMS Gen 2 patterns?
- No, this jig is specifically designed for DPMS Gen 1 .308 patterns only. The rail height and pin locations differ by 0.125 inches in Gen 2 models, requiring a different jig configuration. Always verify your upper receiver compatibility before milling.
- Does it work with a handheld router?
- Yes, the Easy Jig® is optimized for standard 1/4-inch collet routers operating at 15,000-20,000 RPM. We recommend using our <a href="/products/5-16-high-speed-end-mill-for-easy-jig-gen-2/">5/16" High Speed End Mill</a> for clean polymer cuts with minimal heat buildup.
- How long does shipping take?
- Standard shipping requires 3-5 business days for continental US destinations. All kits ship from our Nevada facility via UPS Ground, with tracking information provided within 4 hours of order processing.
- Can I return it if I make a mistake during milling?
- No, once milling has begun the kit cannot be returned due to ATF regulations regarding altered receivers. We recommend practicing on scrap polymer first and following our <a href="/blog/best-drill-bits-for-polymer-80-percent-lower-milling/">precision milling guide</a> to avoid errors.