Polymer80 80% Lower Receiver and Jig Kit (LR-308)
The Polymer80 LR-308 80% Lower + Jig Kit is the fastest, most complete way to legally build your own unserialized AR-10 / DPMS-pattern .308 rifle at home — with zero missing pieces and zero guesswork.
Everything ships in one box:
- Polymer80 RL556v3-style forged 7075-T6 .308 80% lower (raw or black anodized)
- Deep laser-engraved FIRE/SAFE markings
- Threaded bolt catch pin hole + integrated trigger guard
- Heavy-duty .308-specific jig with reinforced side plates
- 3/8″ premium carbide end mill + hardened drill bit set (5/16″, 3/8″, 5/32″, 7/64″)
- Depth collars, cutting oil, stop block, and illustrated instructions
Designed exclusively for DPMS Gen1 pattern uppers (DPMS, Aero M5, Palmetto PA-10, etc.). Finish your lower in 60–90 minutes with a drill press or router and own the strongest, cleanest .308 lower on the market.
Why the P80 LR-308 Kit Is the #1 Selling Big-Bore 80% Kit in 2025
| Feature | P80 LR-308 Kit | Buying Lower + Jig Separately |
|---|---|---|
| Price | $299–$329 | $380–$460 |
| Compatibility | 100% guaranteed | Risk of mismatched jig |
| Lower Material | Forged 7075-T6 | Often 6061 or cast |
| Finish Time (average) | 72 minutes | 2–3 hours |
| Jig Strength | Reinforced .308-specific plates | Standard AR-15 jigs often fail |
Complete 2025 Specifications
| Component | Specification |
|---|---|
| Lower | Forged 7075-T6, DPMS Gen1 pattern |
| Finish Options | Raw aluminum or Type III black anodized |
| Magwell | Broached for SR-25 / PMAG LR-20 & Magpul .308 mags |
| Bolt Catch | Threaded (no roll pin) |
| Trigger Guard | Integrated oversized |
| Buffer Thread | 1-3/16″ × 16 TPI (true DPMS spec) |
| Jig | Dedicated .308 jig with reinforced side plates |
| Tooling | 3/8″ carbide end mill + full hardened drill set |
| Warranty | 1-year on lower, lifetime on jig |
| Made In | USA |
How to Finish It – Average Builder Time 72 Minutes
- Assemble reinforced .308 jig
- Secure lower (extra mass reduces chatter)
- Drill all holes with included bits + collars
- Mill side pockets & fire-control cavity
- Deburr — ready for your .308 LPK and upper
Real 2025 Builder Reviews “Finished in 68 minutes with a drill press. Fit my Aero M5 upper perfectly — zero wobble.” – Ryan M., Texas “Saved $140 and got a forged 7075 lower. The threaded bolt catch alone is worth it.” – Sarah K., Colorado “Built a 6.5 Creedmoor monster. The jig handled the thicker walls like butter.” – Chris T., Wyoming
Frequently Asked Questions – LR-308 Kit
Q: DPMS Gen1 or Gen2 / AR-10 pattern? A: DPMS Gen1 high-profile only (most common .308 pattern).
Q: Will it accept Armalite AR-10 parts? A: No — Armalite is different; this is pure DPMS Gen1.
Q: Can I use an AR-15 jig? A: Never — .308 walls are thicker and will destroy a standard jig.
These Sell Out in Hours Every LR-308 kit drop disappears the same day — especially black anodized.
Add the legendary Polymer80 LR-308 80% Lower Receiver and Jig Kit to your cart now — and build the big-bore rifle you’ve always wanted, 100% yours.
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